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Cell Injury 1
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Pathology I Images
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1. Patient: central cyanosis
The patient on the left has a markedly cyanotic
(blue) tongue compared to the normal patient�s
tongue on the right. Central cyanosis is due to an
increased amount of unoxygenated hemoglobin
(Hgb) in the blood (called deoxyhemoglobin). This
translates into a decrease in the oxygen saturation
of blood (percentage of the heme groups on Hgb
occupied by oxygen). Central cyanosis is due to any
cause of hypoxemia (e.g., respiratory acidosis,
ventilation/perfusion/diffusion problems in the lungs,
right to left shunting of blood in cyanotic congenital
heart disease), since a low arterial PO2
automatically lowers the amount of O2 that diffuses
into the RBC to bind to heme. Peripheral cyanosis
refers to vasoconstriction of the blood vessels in the
skin with central shunting of the blood (e.g.,
hypothermia). The skin is cyanotic, however the
mucous membranes are pink. (Ci001)
2. Liver biopsy: lipofuscin
The brown pigment noted in the hepatocytes (arrow)
represents lipofuscin (wear and tear pigment).
Lipofuscin is the end product of free radical injury of
cells and autophagy (destruction of cell organelles
and structural proteins in cells undergoing atrophy).
Grossly, an excess of lipofuscin produces a brown
discoloration, hence the term brown atrophy.
Lipofuscin is commonly found at autopsy in elderly
patients. (Ci201)
3. Liver: viral hepatitis with apoptosis
The arrow points to an anucleate, deeply eosinophilic
staining cell that is retracted away from the other
cells. The last phase of destruction of this cell will be
fragmentation into apoptotic bodies containing
bound packets of organelles which will be
phagocytosed and destroyed in the lysosomes of
macrophages and neighboring cells. Note that there
is no inflammatory infiltrate around the cell.
(Ci202)
4. Heart: pale infarction with coagulation
necrosis
The anterior part of the heart is at the bottom of
the slide. The left ventricle is on your left and the
Cell Injury 1
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right ventricle on your right. The arrows point to a
pale infarct in the entire anterior part of the heart
and anterior two-thirds of the interventricular
septum. The patient had a platelet thrombus in the
left anterior descending coronary artery, which
supplies blood in the same distribution outlined by
the infarction. Coagulation necrosis is the
underlying pathologic process. The infarct is pale
owing to the dense consistency of muscle so that
extravasated RBCs from necrotic vessels remain
localized and are unable to percolate through the
tissue. (Ci002)
5. Heart: coagulation necrosis
Recall that in coagulation necrosis, the accumulation
of lactic acid in the hypoxic tissue causes
denaturation of the proteins and enzymes in the
cell. Hence, the cells retain their basic outline but
cannot be autodigested owing to the denaturation of
their enzymes. Neutrophils from outside the area of
infarction will have to destroy the tissue, which will
eventually be replaced by collagen in a scar. Note
that the cells are deeply eosinophilic (see arrow).
Nuclei and cross striations are not evident. (Ci003)
6. Toe: dry gangrene in a patient with diabetes
mellitus (coagulation necrosis)
The big and little toe are blackened. A pressure
ulcer is noted overlying the metatarsal head of the
big toe. The cause of the gangrene is
artherosclerotic occlusion of the popliteal artery. This
is a dry gangrene with predominantly coagulation
necrosis since there is no evidence of exudate
indicating an anaerobic infection. In the latter case,
the predominant type of necrosis is liquefactive
necrosis, since infection with neutrophils is present.
This is called wet gangrene. (Ci206)
7. Spleen: pale infarction
Note the roughly wedge shaped pale area of
infarction extending to the surface of the splenic
capsule (see arrow). The infarct is pale since the
tissue texture of the spleen does not allow RBCs to
diffuse easily through the tissue. Most causes of
splenic infarctions originate from embolization of clot
material or bacterial vegetations from the left heart
into the aorta with eventual deposition in distal
organs. If the splenic vein was thrombosed, the
infarct would have been hemorrhagic. (Ci004)
8. Small bowel: transmural infarction
(hemorrhagic infarction)
Note the dark red hemorrhage into the wall of the
small bowel and the normal appearing proximal and
distal bowel. The small bowel is the most common
segment of bowel that infarcts owing to the single
Cell Injury 1
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blood supply- superior mesenteric artery. A
thrombus overlying a proximal atherosclerotic plaque
at the orifice of the artery or embolization from the
left heart are common causes of infarction of the
small bowel. (Ci005)
9. Lung: gross of a pulmonary infarction
(hemorrhagic infarct)
Note the wedge-shaped area of hemorrhage
extending to the pleural surface (see arrow). This is
an example of a hemorrhagic infarction and is most
often secondary to emboli originating from clots that
developed in the femoral veins in the legs. Most
venous clots initially develop in the deep veins of
the calf, however, as they propagate proximally into
the femoral venous system, they break off and
embolize to the lungs. The embolized vessel is
visible at the apex of the infarct (see arrow). Recall
that hemorrhagic infarcts usually develop in tissues
that have a loose texture, so that blood
extravasating from necrotic vessels can percolate
through the tissue. The wedge-shaped infarct is due
to the parallel branching of the pulmonary vessels.
Hence, a proximally located obstruction in the lumen
of a pulmonary vessel affects the blood flow to a
large cross-sectional area of branching vessels that
are distal to the obstruction (perfusion defect). The
same concept applies to a mucous plug in a terminal
bronchiole. Recall that the small airways also branch
in parallel, hence a proximally located plug affects a
large cross-sectional area of distally branching
airways. (Ci006)
10. Brain: old artherosclerotic stroke with cystic
cavity (liquefactive necrosis)
Note the cystic cavities in the brain. Recall that
infarction in the brain is not coagulative but
liquefactive necrosis owing to the lack of good
structure in the brain and the abundance of
lysosomes in neuroglial cells. (Ci210)
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Cell Injury 2
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Pathology I Images
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11. Brain: cerebral abscess
Note the cavitary lesion in the brain, which is lined
by a shaggy, necrotic material (see arrow). Cerebral
abscesses, like cerebral infarctions, are examples of
liquefactive necrosis. Cerebral abscesses may be
due to local extension of an infection (e.g.,
mastoiditis, sinusitis) or hematogenous spread of a
bacteria.
(Ci007)
12. Wrist: abscess due to Staphylococcus
aureus (liquefactive necrosis)
Note the raised, erythematous area on the wrist
with a central area of draining from a sinus tract.
Recall that S. aureus is a gram positive coccus that
has coagulase. Coagulase converts fibrinogen into
fibrin, which keeps the infection localized. This is an
example of liquefactive necrosis. (Ci209)
13. Lung: gross of lung exhibiting
bronchopneumonia
Note the patchy yellow, raised areas throughout the
lung parenchyma (see arrow). These represent
collections of neutrophils in the pulmonary
parenchyma that first caused acute inflammation
involving the small airways (acute bronchitis) and
spilled over into the surrounding lung parenchyma
causing bronchopneumonia. The progression of a
bronchitis into the lung parenchyma is called
bronchopneumonia. Streptococcus pneumoniae, a
gram positive diplococcus, is the most common
pathogen responsible for community acquired
bronchopneumonia. Bronchopneumonia may cause
liquefactive necrosis, since neutrophils are present in
the tissue and producing enzymes which may
destroy the tissue. (Ci008)
14. Lymph node: localized granuloma (caseous
necrosis) in a patient with tuberculosis
Note the very well circumscribed eosinophilic
staining granuloma. In the middle of the granuloma,
the pink staining material is acellular. This
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represents caseous necrosis. Note the
multinucleated giant cells at 2 and 7 o'clock. The
following slide is a high power view of the
granuloma. (Ci211)
15. Lymph node: localized granuloma (caseous
necrosis) in a patient with tuberculosis
Note the eosinophilic appearing necrotic center of
the granuloma (see arrow) and the wall of the
granuloma containing a multinucleated giant cell
(see arrow). The pink staining cells in the wall
represent activated macrophages (called epithelioid
cells). The interaction of macrophages containing
processed TB organisms causes the helper T cells to
release gamma interferon, which activates the
macrophage and allows it to kill the TB. The cell
walls of TB are rich in lipid, which causes the
necrotic debris to have a cheezy appearance, hence
the term caseous necrosis. Multinucleated giant
cells represent macrophages fused together.
Granulomas are an example of type IV cellular
immunity. (Ci011)
16. Pancreas: acute pancreatitis with enzymatic
fat necrosis
Note the C shaped pancreas on the left of the slide.
The duodenum encompasses the head of the
pancreas and the body and tail extend to the right.
Note the chalky white areas (see arrows)
representing calcium interacting with fatty acids
derived from breakdown of fat by pancreatic lipases.
This is called saponification. The calcification is
also an example of dystrophic calcification, which is
calcification of damaged tissue. Pancreatic
calcifications are visible on x-ray, ultrasound, or CT
scans. The red areas in the pancreas (see arrows)
represent hemorrhage due to rupture of vessels
destroyed by elastases in the pancreas. Acute
pancreatitis is most often due to alcohol and biliary
tract disease. Serum lipase and amylase are both
elevated. Pain radiates into the back since the organ
is retroperitoneal. (Ci010)
17. Pancreas: histologic section of enzymatic fat
necrosis in an alcoholic with acute pancreatitis
The blue staining area represents enzymatic fat
necrosis where calcium has bound with fatty acids to
form a calcium salt. These can be visualized on xray,
particularly after repeated attacks of acute
pancreatitis. Calcium deposits in necrotic tissue are
called dystrophic calcification. (Ci213)
18. Arteriole: fibrinoid necrosis
Note the pink staining material in the wall of this
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arteriole (see arrow) that has been totally
destroyed. This is an example of small vessel
vasculitis, the majority of which are due to type III
immunocomplex disease. Immunocomplexes deposit
in the vessel and activate the alternative
complement system, which releases C5a, a
chemotactic agent that attracts neutrophils. The
neutrophils destroy the vessel. The pink staining
material represents protein from the plasma in the
vessel lumen. Fibrinoid necrosis is the necrosis of
immune disease and is seen in the vegetations
associated with acute rheumatic fever and
inflammation associated with many collagen vascular
diseases. (Ci012)
19. Liver: gumma in tertiary syphilis
Note the white nodular lesions in the liver
parenchyma (see arrow). Gummas have a rubbery
consistency. They are examples of gummatous
necrosis, which is unique to tertiary syphilis.
There is nothing on gross examination of these
masses that would distinguish them from primary or
metastatic cancer, hence a microscopic section and
history would be necessary to make the correct
distinction. (Ci013)
20. Liver: cirrhotic liver with fatty change
Note the diffuse nodularity of the liver and the
yellowish discoloration representing fatty change.
This patient was most likely an alcoholic, since
alcohol is the most common cause of fatty change
and cirrhosis of the liver. Refer to the class notes
for the pathophysiology of fatty change. (Ci017)
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Cell Injury 3
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Pathology I Images
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21. Liver: fatty change secondary
to alcoholism
The accumulation of triglyceride (TG)
in the liver or fatty change is a
reversible reaction induced by a
number of different agents, the most
common of which is alcohol. Its
favored location in hepatocytes
around the central veins in the liver
(see arrow on left side of the slide) is
closely linked to the mechanics of
blood flow from the portal triads to
the central vein. Hepatic artery and
portal vein tributaries in the portal
triads (see arrow on the right side of
the slide) discharge blood into the
liver sinusoids, which are located inbetween
cords of hepatocytes. The
sinusoidal blood drains into the
central veins, which coalesce to form
the hepatic vein. Hepatocytes located
around the central veins receive less
O2 and other nutrients than those
surrounding the more peripherally
located portal triads, which benefit by
having the first exposure to the
blood. This structural arrangement
renders the central vein-associated
hepatocytes more susceptible to
drugs or chemicals, whose metabolic
products form free radicals or toxic
substances, also fatty change
secondary to alcohol and tissue
hypoxia. Note how the fatty change
(see middle arrow) is located around
the central veins rather than the
portal triad.
In general, the two primary
mechanisms involved in the
production of fatty change in the liver
relate to (1) increased synthesis of
TG secondary to an increase in key
substrates, such as fatty acids and
glycerol 3-phosphate, and (2)
problems in the secretion of TG from
Cell Injury 3
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the hepatocyte into the plasma (e.g.,
deficiency of apolipoproteins). Sources
of fatty acids include excess lipolysis
of adipose tissue (e.g.,
corticosteroids, starvation, alcohol),
increased production of acetate (a
product of alcohol metabolism), and
increased synthesis of fatty acids
from acetyl CoA (a product of alcohol
metabolism). Refer to course notes
for Biochemistry discussion.
(Ci018A)
22. Aorta: aorta with complicated
atheromatous plaques
Note the red clots, fissured
endothelial surface, and raised
plaque-like structures from the
surface of the aorta (see arrow). This
is an example of advanced
atherosclerosis. This patient had an
increase in low-density lipoprotein
(LDL), the lipoprotein fraction that
carries the majority of cholesterol.
In the cardiovascular lectures, you
will be introduced to the reaction to
injury theory of atherosclerosis that is
ultimately responsible for the changes
noted in this slide. The fibrofatty
plaques that normally occur with the
reaction to injury on the aorta and
muscular arteries are commonly
calcified. Calcification of damaged
tissue is called dystrophic
calcification. Calcification
significantly impairs the elasticity of
the aorta, hence it cannot expand
with blood during systole nor can it
contract and help send the blood
distally. (Ci019)
23. Patient�s with lipid
deposits: collage of lipid deposits
in the skin
In the left upper corner of the slide,
note the papular yellow structures
representing triglyceride (TG)
deposited in the skin in a patient with
an excess of very low density
lipoprotein (VLDL). This commonly
occurs in diabetic ketoacidosis. The
patient in the right upper corner has
deposits of cholesterol in the Achilles
tendons (tendon xanthoma). This
lipid deposit is pathognomonic for the
autosomal disease called familial
hypercholesterolemia. In this fatal
disorder, the LDL receptors are
absent, hence LDL accumulates in the
blood. The patient in the lower frame
has cholesterol deposits in the eyelids
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called xanthelasmas. These
commonly occur in patients with very
high cholesterol levels. (Ci020)
24. Patient: xanthelasma
This is a close-up of the patient in
the previous slide.
(Ci021)
25. Skin: malignant melanoma
Malignant melanomas are
malignancies of melanocytes, which
contain melanin pigment. (Neo203)
26. Lungs: anthracotic pigment in
a patient with "black lung" disease
Note the heavy deposition of black
pigment in this lung (see arrow) from
a patient with coal worker�s
pneumoconiosis (dust-related
pulmonary disease). The large spaces
in the apex of this lung represent
emphysema secondary to damage
associated to the respiratory
bronchioles from the excess
anthracotic pigment. "Black lung"
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disease is a crippling disease and is
associated with an increased
incidence of TB.
(Ci028)
27. Lymph nodes: anthracotic
pigment deposition
Note the diffuse black pigmentation in
the lymph nodes. This gross
specimen could easily be mistaken for
melanin pigment in a patient with
metastatic malignant melanoma.
Recall that anthracotic pigment is
coal dust and is commonly found in
coal miners or in inhabitants of cities
that have a great amount of pollution.
Pollutants that are in the air and
breathed into the lungs often produce
disease. (Ci029)
28. Pancreas: hemochromatosis
The pancreas at the top of the slide is
stained with Prussian blue and the
one on the bottom of the slide is its
unstained appearance in this patient
who had hemochromatosis. In the
unstained pancreas, note the increase
in fibrous tissue replacement of the
gland, which is a reaction to injury
secondary to free radicals generated
by the excess iron. Both exocrine and
endocrine deficiency eventually occur,
the former leading to maldigestion
and the latter to diabetes mellitus.
(Ci024)
29. Liver: microscopic section of
liver in hemochromatosis
Note the golden brown pigment in the
liver parenchymal cells (see arrow)
and the inflammatory infiltrate. Recall
that iron enhances the synthesis of
hydroxyl free radicals, which in turn
damage the tissue. In this case, the
damage is in the form of fibrosis,
which results in cirrhosis of the liver.
Hemochromatosis is the second most
common genetic disease (AR
inheritance) in the United States. It is
due to an unrestricted reabsorption of
iron from the duodenum. (Ci023)
30. Sputum: rusty colored sputum
(left), hemoptysis (right)
Rusty colored sputum implies the
breakdown of RBCs and their
phagocytosis by alveolar macrophages
(e.g., chronic pulmonary edema).
Alveolar macrophages are normally in
the respiratory unit in the distal
airways. Hemoptysis, or coughing up
blood, implies a bleeding event that is
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more proximal than the small airways
(e.g., bronchogenic carcinoma).
(Ci026)
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Cell Injury 4
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Pathology I Images
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Cell Injury
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31. Lungs: chronic pulmonary congestion with
hemosiderin laden alveolar macrophages
Note the rusty colored material in the alveolar
macrophages. This patient had chronic pulmonary
edema from left heart failure. The increased
hydrostatic pressure in the pulmonary capillaries
causes them to rupture, hence releasing RBCs into
the alveoli. Alveolar macrophages phagocytose the
RBCs and hemosiderin accumulates in the
cytoplasm. In the setting of heart failure, these cells
are called heart failure cells, which are frequently
expectorated and produce a rusty colored sputum.
(Ci025)
32. Patient�s lower legs: stasis dermatitis of
the left lower leg and secondary varicose veins
In the lower extremities, the venous blood flows
from the superficial varicose veins through
penetrating branches into the deep veins of the leg
and back to the heart. Valves prevent reflux of
blood back to the superficial system and keep the
blood moving back towards the heart. However,
around the ankles, the flow of blood is from the
deep veins through penetrating branches back into
the superficial system. In this patient, note the
brownish discoloration of the lower leg (see arrow),
ulceration of the skin, and the dilated superficial
saphenous veins proximal to the discoloration (top
arrow). The series of events that produced these
changes began with a deep vein thrombosis with a
backup of venous blood under pressure into the
small penetrating branches around the ankles.
Initially, the increased hydrostatic pressure produces
swelling of the tissue. This is followed by rupture of
the blood vessels with extravasation of blood into
the surrounding tissue. With the eventual breakdown
of RBCs in the subcutaneous tissue, hemosiderin is
left behind, hence the brown discoloration of the
tissue. The stagnated venous blood in the ankle also
leaves very little oxygen and nutrients for the
tissue, hence the eventual ulceration of the skin
surface as noted in the area of discoloration. The
back up of venous pressure also increases the blood
flow back into the superficial saphenous system
leading to dilatation of these veins and eventual
Cell Injury 4
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impairment of their valves. This is called secondary
varicose veins (secondary implying that the disease
did not begin in the superficial system but in the
deep venous system). (Ci022)
33. Kidneys: increased glycogen deposition in
the renal tubules
Note the clear spaces in the renal tubules due to
increase in glycogen (see arrow). That the clear
spaces represent glycogen must be documented with
a PAS stain, since cellular swelling in early tissue
hypoxia can also produce this change. This patient
has von Gierke�s disease, an autosomal recessive
disease where glucose 6-phosphatase, a
gluconeogenic enzyme, is deficient. Deficiency of the
enzyme leads to a low glucose (fasting
hypoglycemia) and a distal buildup of glucose 6-
phosphate, which is the substrate from which
glycogen is synthesized. Since gluconeogenic
enzymes are in the liver and kidney, the glycogen
accumulation primarily occurs in these organs.
(Ci030)
34. Patient eyes: Scleral icterus
Note the yellow discoloration of the sclera. Either
unconjugated on conjugated bilirubin can produce
this change. The sclera contains abundant elastic
tissue, which has a high affinity for bilirubin.
Bilirubin is primarily a breakdown product of
macrophage destruction of senescent RBCs.
(Hep200)
35. Aortic valve: bicuspid aortic valve with
dystrophic calcification leading to aortic
stenosis
Note that the aortic valve has two rather than three
cusps. This is a congenital bicuspid aortic valve.
Since two cusps are doing the job of three cusps,
they are damaged over time and develop dystrophic
calcification (see arrow), which narrows the orifice
of the valve leading to stenosis. Aortic stenosis
results in problems with opening of the valve and
the ejection of blood during systole. Left
ventricular hypertrophy with concentric pathologic
hypertrophy is a response to the valve stenosis.
(Ci031)
36. Muscle: metastatic calcification
Note the blue-black deposits of calcium in
apparently normal muscle (see arrow). This patient
had primary hyperparathyroidism with an
increase in calcium leading to metastatic calcification
of normal tissue. If metastatic calcification occurred
in the heart or the basement membrane of the
tubules, the patient could develop heart block or
renal failure (nephrocalcinosis), hence metastatic
calcification may be dangerous. (Ci032)
37. Peripheral blood smear: spherocytes
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Note the dense RBCs without a central area of
pallor (see arrow). Since normal RBCs are biconcave
discs with a thin central region containing less
hemoglobin than the thicker edges of the RBC, an
RBC that is a sphere is completely filled with
hemoglobin, hence the absence of a central area
of pallor. Spherocytes have less RBC membrane
than a normal RBC due to a defect in spectrin in
the cell membrane. There are many causes of
spherocytes in the peripheral blood besides
congenital spherocytosis, such as autoimmune
hemolytic anemia, ABO hemolytic disease of the
newborn, to name a few. The blue staining RBCs in
the peripheral blood represent young RBCs with
residual RNA (reticulocytes). (Ci034)
38. Liver biopsy: Mallory bodies in alcoholic
hepatitis
Note the spaces in the liver biopsy representing
fatty change (see arrow) and the pink staining
material in the hepatocytes (see arrow) representing
Mallory bodies. Mallory bodies represent damaged
keratin intermediate filaments that have been
"ubiquinated" by ubiquitin, hence marked for
destruction. An acetaldehyde-protein complex is
responsible for the damage. Mallory bodies are most
commonly seen in the setting of an alcoholic with
fever, neutrophilic leukocytosis, and painful
hepatomegaly, the latter representing alcoholic
hepatitis. (Ci033)
39. Brain: atrophy
Note the loss of brain mass, which causes
separation of the gyri and sulci. This is most
commonly caused by atherosclerosis of the
internal carotid artery. Chronic tissue hypoxia causes
the neurons in layers 3, 5, and 6 of the cerebral
cortex to undergo apoptosis. Drop out of these
neurons causes a loss in brain mass, which is
evident in this slide. Other causes include
degeneration of the neurons in Alzheimer's disease
or destruction of neurons by infection. (Ci035)
40. Cerebral cortex: "red neurons"
Note the spaces in the cerebral cortex tissue
representing cerebral edema. The neurons are the
cells with the eosinophilic staining cytoplasm and
pyknotic nuclei (see arrow). The pathologic process
causing the changes in the neurons is called
apoptosis. Recall that apoptosis refers to activation
of programmed cell death with individual cell
necrosis. The cytoplasm of apoptotic cells becomes
intensely eosinophilic and the nucleus condensed.
Neurons, which are permanent types of cells that
can no longer divide, are extremely sensitive to
injury in tissue hypoxia. When they die, they
undergo apoptosis and produce these "red neurons".
(Ci036)
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Cell Injury 4
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Cell Injury 5
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Cell Injury
1 | 2 | 3 | 4 | 5 | 6
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41. Kidney: hydronephrosis with compression
atrophy
Note the dilated renal pelvis and calyceal system
and the thinning of the renal cortex related to the
increased pressure. The increased pressure
imposed on the renal cortex causes it to undergo
atrophy (compression atrophy). Hydronephrosis
always implies obstruction to urine flow, which may
be secondary to prostate hyperplasia, a renal stone
(most common), pregnancy, or cancer at the
ureterovesical junction.
(Ci037)
42. Kidneys, renal arteries, aorta: renal atrophy
owing to atherosclerosis of the proximal portion
of the renal artery
The small kidney on your left (see arrow) has
undergone atrophy owing to an atherosclerotic
plaque partially blocking the opening of the renal
artery. Note that the renal artery in the normal
kidney is patent. Recall that reducing blood flow to
the kidney leads to stimulation of the reninangiotensin-
aldosterone system. The juxtaglomerular
apparatus located on the afferent arteriole is
stimulated to release the enzyme (not hormone)
renin. Renin cleaves angiotensinogen into AT-I. AT-I
is converted into AT-II in the lungs by the enzyme,
angiotensin converting enzyme (ACE). ATII is a
potent vasoconstrictor and also stimulates the 18-
hydroxylase enzyme in the zona glomerulosa to
convert corticosterone into aldosterone. Aldosterone
reabsorbs sodium in the distal and collecting
tubules, hence increasing plasma volume.
Hypertension, is the end-result of peripheral
vasoconstriction of the arterioles by ATII and
increased plasma volume by aldosterone.
Hypertension secondary to renal artery
atherosclerosis is called renovascular
hypertension. As expected, the renal vein renin
levels in the small kidney are increased. However,
renal vein renin levels in the normal kidney should
be suppressed, since the increased levels of ATII
and aldosterone inhibit renin release from the
normal kidney. (Ci038)
43. Muscle: atrophy
Cell Injury 5
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Note the markedly atrophic muscle fibers with
eosinophilic cytoplasm and pyknotic nuclei (see
arrow). Skeletal muscle atrophy may occur with
disuse (e.g., cast on the leg), primary muscle
disease (e.g., Duchenne's muscular dystrophy), or
loss of nerve stimulation (e.g., amyotrophic lateral
sclerosis, compression of a nerve by a ruptured
intervertebral disc). (Ci039)
44. Pancreas: cystic fibrosis (atrophy)
Note the eosinophilic material blocking the ducts and
the increase in connective tissue surrounding the
ducts. Thick secretions in CF block the lumens and
the pressure is transmitted back into the exocrine
glands leading to atrophy via individual cell necrosis
(apoptosis). Loss of exocrine secretions leads to
malabsorption of fats, carbohydrates, and protein.
(Ci222)
45. Hearts: normal on the left and
concentrically hypertrophied on the right
The heart on the left is normal. The heart on your
right has left ventricular hypertrophy (LVH) with
concentric hypertrophy of the muscle (see arrow)
leading to a diminished left ventricular chamber with
very little space for blood. Concentric hypertrophy of
cardiac muscle is due to an increased resistance
against which the ventricles must contract to expel
blood out of the ventricle (increased afterload).
Examples include the increased peripheral resistance
in the arterioles associated with essential
hypertension (most common) and aortic valve
stenosis (narrow opening to the valve). (Ci042)
46. Muscle: hypertrophy
Note the increased size of the individual muscle
fibers and increased size of the nuclei representing
hypertrophy (see arrow). Hypertrophy of a muscle
increases the force of contraction of the muscle,
since there are twice as many contractile fibers in
the cytosol than a normal muscle. Recall the
hypertrophied cells pass through the S phase but
cannot mitose, hence they have twice the DNA (4N).
(Ci046)
Cell Injury 5
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47. Endometrial mucosa: normal endometrial
gland in the proliferative phase of the
menstrual cycle
Recall that the proliferative phase of the cycle is an
estrogen primed event. Estrogen is a growth
promoter and causes the endometrial glandular cells
to mitose and undergo mitotic divisions (see arrow),
which cause the glands to increase in number. This
is an example of physiologic hyperplasia.
(Ci047)
48. Endometrial mucosa: pathologic
endometrial hyperplasia due to unopposed
estrogen stimulation
When comparing this slide with 047, it is apparent
that far more glands are present and they are
crowded together. This occurs when a woman has
too much estrogen and not enough progesterone,
the latter a hormone that causes endometrial glands
to undergo atrophy. Examples of unopposed
estrogen include a postmenopausal woman who is
taking estrogen without progesterone to prevent
osteoporosis or an obese woman, who has increased
aromatization of androgens into estrogens in the
adipose. If endometrial gland hyperplasia persists,
endometrial dysplasia, and eventually endometrial
carcinoma may occur. (Ci048)
49. Prostate gland: prostatic hyperplasia
The prostate gland has an outer rim (peripheral
zone), central zone, and transitional zone, the latter
surrounding the prostatic urethra. The gland is under
the control of dihydrotestosterone (DHT). Recall that
DHT is normally responsible for development of the
prostate in the fetus, hence an increase in DHT
leads to benign prostatic hyperplasia (BPH). BPH
primarily occurs in the transitional zone around the
urethra. Note how the prostate gland literally bulges
(see arrow) when sectioned. Nodular areas are
noted throughout the gland and represent areas of
hyperplasia. The surrounding hyperplastic tissue
compresses the prostatic urethra in the center of
the gland. Symptoms of BPH relate to urethral
obstruction. Symptoms include delayed initiation of
the urinary stream, narrow urinary stream,
increased frequency of urination (patient often
wakes up at night to urinate), dribbling at the end
of urination, and the possibility of complete
obstruction to urine flow. Complete obstruction of
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urinary flow causes a back-up of urine into the
bladder. This backup of urine dilates the bladder and
causes hypertrophy of the smooth muscles in the
bladder wall, since they are contracting against
increased resistance. Furthermore, the urine backs
up into the ureters (dilated) and renal pelvises
causing dilatation. This is called hydronephrosis.
(Ci051)
50. Prostate and bladder: prostatic hyperplasia
with subsequent hypertrophy of the muscle in
the bladder wall
Normally, the prostate gland has an outer rim
(peripheral zone), central zone, and transitional
zone, the latter surrounding the prostatic urethra.
The gland is under the control of
dihydrotestosterone (DHT, recall that DHT is
normally responsible for development of the
prostate in the fetus), hence an increase in DHT
leads to benign prostatic hyperplasia (BPH). BPH
primarily occurs in the transitional zone around the
urethra. Note how the cut surface of the prostate
gland bulges (see arrow). Nodular areas are noted
throughout the gland and represent areas of
hyperplasia. The surrounding hyperplastic tissue
compresses the prostatic urethra in the center of
the gland. Symptoms of BPH relate to urethral
obstruction. Symptoms include delayed initiation of
the urinary stream, narrow urinary stream,
increased frequency of urination (patient often
wakes up at night to urinate), dribbling at the end
of urination, and the possibility of complete
obstruction to urine flow. Complete obstruction of
urinary flow causes a back up of urine into the
bladder. This backup of urine dilates the bladder and
causes hypertrophy of the smooth muscles in the
bladder wall, since they are contracting against
increased resistance. Furthermore, the urine backs
up into the ureters (dilated) and renal pelvises
causing dilatation. This is called hydronephrosis.
(Ci052)
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Cell Injury 6
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Cell Injury
1 | 2 | 3 | 4 | 5 | 6
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51. Bone marrow: RBC hyperplasia
Normally, there should be a 3:1 ratio of leukocytes
to RBCs. However, most of the nucleated cells in
this smear are erythroid precursors, hence RBC
hyperplasia is present. The stimulus, in most cases,
is tissue hypoxia with release of erythropoietin
from the endothelial cells of the peritubular
capillaries in the kidneys. If this smear was from a
patient returning from a three-week trip in the
Andes mountains, it would be an example of
physiologic hyperplasia. However, if it was a
smear from a smoker with obstructive lung disease,
it would be pathologic hyperplasia. (Ci225)
52. Skin: psoriasis (pathologic hyperplasia)
Note the raised, erythematous skin lesion covered
by silvery scales. This is the classic appearance and
location for psoriasis. It is due to an unregulated
hyperplasia of squamous cell proliferation in the
epidermis. (Ci226)
53. Skin: histologic section of psoriasis
(pathologic hyperplasia)
Note the increase in stratum corneum surfacing the
epidermis. This corresponds to the silvery scales in
the previous slide. Also note the increased overall
thickness of the epidermis owing to hyperplasia.
Recall that the cells in the basal cell layer are stem
cells (labile cells). (Ci227)
54. Uterus: gravid uterus
Note the marked enlargement of the gravid uterus.
This is secondary to an equal amount of both
hyperplasia and hypertrophy of smooth muscle cells
under the stimulation of estrogen. Recall that
smooth muscle cells are stable cells, hence they
may undergo both hypertrophy and hyperplasia.
Striated muscle and cardiac muscle are permanent
cells and are only capable of undergoing
hypertrophy. (Ci053)
Cell Injury 6
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55. Distal esophagus and proximal stomach:
gastroesophageal reflux disease (GERD) with
ulceration
Subjacent to the ruler, note the extreme ulceration
of the mucosal surface of the distal esophagus
(reddened area) leaving only a midline tongue of
residual esophageal mucosa. The ulceration is due to
an incompetent lower esophageal sphincter and
reflux of acid into the distal esophagus. Note the
proximal stomach rugae at the bottom of the slide.
(Ci228)
56. Distal esophagus: glandular metaplasia
secondary to acid reflux (Barrett�s
esophagus)
The distal esophagus should be lined by squamous
epithelium. However, due to acid reflux from the
stomach into the distal esophagus (gastroesophageal
reflux disease - GERD), the epithelium has
undergone glandular metaplasia (called Barrett's
esophagus) with mucin production as a reaction to
acid injury. In GERD, the lower esophageal sphincter
is relaxed which allows for acid reflux into the distal
esophagus. The arrows point to glandular tissue
synthesizing mucin (top arrow) and glandular tissue
that has differentiated into goblet cells (bottom
arrow). If left untreated with antacids (e.g.,
Mylanta) and drugs that prevent acid production
(e.g., H2 blockers of parietal cell, proton blockers),
glandular metaplasia may progress into glandular
dysplasia and adenocarcinoma. Distal esophageal
adenocarcinoma due to a Barrett's esophagus has
now replaced squamous carcinoma of the esophagus
as the most common primary esophageal cancer.
(Ci054)
57. Distal esophagus: special stain enhancing
the presence of glandular metaplasia secondary
to acid reflux (Barrett�s esophagus)
Note the red staining mucous and blue-staining
mucin in the goblet cells. (Ci055)
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58. Bladder biopsy: squamous metaplasia
secondary to Schistosoma hematobium
The overlying transitional epithelium has been
replaced by squamous epithelium (see arrow). This
is an example of squamous metaplasia and is due to
the inflammatory reaction in the submucosa hosted
against the eggs of S. hematobium (see arrow).
Squamous metaplasia may progress to dysplasia
and squamous cancer. Note the heavy eosinophil
inflammatory infiltrate around the eggs. Eosinophils
attach to IgE coating the surface of the eggs and
degranulate with release of major basic protein
(MBP). MBP destroys the eggs. This is an example
of a type II hypersensitivity reaction. (Ci057)
59. Cervical biopsy: severe dysplasia
Note the loss of orientation of the squamous
epithelium throughout most of the thickness of the
epithelium. Large cells with irregular nuclear
contours are noted in the superficial layer of the
epithelium (see arrow). Normally, only the basal cell
layer or cells immediately above the basal cells
contain mitotically active stem cells (labile tissue)
that are responsible for cell division. As the cells
mature, they progress to the surface of the
epithelium and cease to undergo mitosis. Here
mitoses are seen in higher layers. This atypical
hyperplastic process is called dysplasia, which, in
this case, could progress into squamous cancer.
Recall that cervical squamous cancer is associated
with human papilloma virus infections of the
squamous cells. (Ci056)
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Fluids & Hemodynamics
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Pathology I Images
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Fluids and Hemodynamics
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1. Lung: Pulmonary edema secondary
to left heart failure (transudate)
Note the white, bubbly fluid exuding from
the surface of the lungs. In left heart
failure, the blood builds up behind the
failed heart and leads to an increase in
left ventricular end-diastolic
volume/pressure. The pressure is
further transmitted back into the left
atrium and pulmonary vein. When the
hydrostatic pressure in the pulmonary
capillaries overrides the oncotic pressure,
a transudate leaks into the alveoli
causing pulmonary edema. (flh200)
2. Face: Swelling due to an
anaphylactic reaction to a bee sting
(exudate)
The patient was stung by a bee on the
arm and within minutes developed
swelling of the arm and left side of her
face. This is an example of a type I
hypersensitivity anaphylactic reaction
with release of histamine from mast cells
leading to increased vessel permeability
and swelling of tissue (exudate). She
should be treated with aqueous
epinephrine 1:1000 injected
subcutaneously to thwart the reaction.
(flh201)
3. Patient with cirrhosis: Ascites and
dependent pitting edema of the legs
(transudate)
Note the abdominal swelling on the left
due to ascites. Ascites is due to a
combination of an increased portal vein
hydrostatic pressure (cannot empty
blood easily into the liver sinusoids) and
decreased oncotic pressure, due to
decreased synthesis of albumin. In
both alterations, a protein and cell poor
transudate accumulates in the peritoneal
cavity. The dependent pitting edema
indicates an increase in TBNa and is due
to the decreased oncotic pressure
(transudate). If this was a patient with
right heart failure, the dependent pitting
edema would be due to an increase in
Fluids & Hemodynamics
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hydrostatic pressure (transudate).
(flh202)
4. Patient's arm: Lymphedema
associated with radiation status post
modified radical mastectomy of the
left breast
Note the diffuse swelling of the entire left
upper extremity. It is due to blockage of
lymphatics related to axillary lymph node
dissection followed by radiation. Lymphatic
fluid leaks into the interstitial space
causing lymphedema. It is typically a
non-pitting type of edema. Longstanding
lymphedema may lead to a
lymphangiosarcoma. (flh203)
5. Patient with diabetic ketoacidosis:
Volume depletion with decreased TBNa
Note the dry tongue in this patient. The
patient's skin turgor was also poor
(tenting of the skin when pinched) and he
was hypotensive. These are all physical
findings of a decreased TBNa, in this
case due to a mixed hypotonic loss of
more water than salt in his urine from
osmotic diuresis secondary to
glucosuria. Most patients in DKA have a
deficit of approximately 6 liters of
hypotonic fluid when they present. He
should first be treated with IV normal
saline to bring his blood pressure back
to normal and then an IV should be
started using 0.45% normal saline
(hypotonic salt solution matching what he
is losing in the urine) within which is
regular insulin and potassium. Any patient
could look like this patient if salt is lost:
e.g., isotonic loss - lose equal amounts of
TBNa and TBW, hypertonic loss - lose
more TBNa than TBW, or hypotonic loss -
lose more TBW than TBNa. (flh204)
6. Patient: Dependent pitting edema of
the lower leg
Pitting edema indicates and increased
TBNa. This patient has right heart failure
as the cause, however, it could also have
been a patient with cirrhosis (gain more
TBW than TBNa), a patient receiving
excess amounts of isotonic (normal) saline
(equal gain in TBNa and TBW), or a
patient with a hypertonic gain of salt (e.g.,
excess sodium bicarbonate, greater gain in
TBNa than TBW). The patient should have
salt and water restriction and be placed
on a loop diuretic. (flh205)
7. Kidney: Ischemic acute tubular
necrosis
Note the renal tubules to the right of the
glomerulus which demonstrate varying
stages of coagulation necrosis (vague
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outlines of tubules). Recall that ischemic
ATN is a common complication of shock
and that the renal medulla is most
susceptible to tissue hypoxia. The tubular
cells will slough off and block the lumen.
Renal tubular casts will form and be
present in the urine sediment. (flh206)
8. EKG with U waves in a patient with
hypokalemia
Note the positive wave after the T
wave. This is called a U wave and is
associated with hypokalemia. Diuretics
are the MCC of hypokalemia. (flh207)
9. EKG with peaked T waves in a
patient with hyperkalemia
Note the peaked T waves after the QRS.
These are associated with hyperkalemia.
Renal failure is the MCC of
hyperkalemia. (flh208)
10. Deep vein of calf: Venous
thrombosis
Note the deep purple colored thrombus in
the vessel lumen. Recall that it is
essentially a blood clot in the lumen
containing coagulation factors, entrapped
RBCs, and platelets. Warfarin and
heparin can prevent these clots, since
they inhibit the formation of fibrin clots
generated by activation of the coagulation
system. Stasis of blood is the MCC of
venous clots in the legs. Embolism of a
venous clot most commonly originates
from clots in the femoral vein rather
than the deep veins of the lower leg.
(flh209)
11. Coronary artery: Platelet thrombus
overlying an atherosclerotic plaque
Note the red thrombus blocking the lumen
of the coronary artery (5 o'clock). It is
composed of aggregated platelet held
together by fibrin strands. Aspirin prevents
the formation of platelet thrombi by
inhibiting platelet aggregation by
thromboxane A2 via irreversible
acetylation of platelet cyclooxygenase.
(flh210)
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12. Bifurcation of the aorta: Arterial
embolus
Note the pale red embolus draped over
the bifurcation of the aorta. The majority
of arterial emboli originate in the left
heart (e.g., mural thrombus). (flh211)
13. Brain: Fat embolism
Note the pinpoint areas of hemorrhage
throughout the brain. The patient
sustained multiple fractures of the pelvis
and femoral bones from a car accident.
Microglobules of marrow fat and fat in the
surrounding tissue enter the injured
vessels and embolize throughout the
body. Symptoms of dyspnea usually
develop with 2-3 days owing to plugged
pulmonary capillaries. In the cerebral
vessels, the microglobules of fat block the
capillary lumens causing rupture of the
vessels. (flh212)
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Inflammation1
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Pathology I Images
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Inflammation
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1. Skin: Bee sting with acute inflammation
Note the central raised area corresponding to the
tumor of acute inflammation. It is due to
histamine release by tissue mast cells. Histamine
increases vessel permeability leading to an
accumulation of protein rich fluid (exudate) in the
interstitial tissue. The redness corresponds to the
rubor of acute inflammation and is due to
histamine-dependent arteriolar vasodilatation. The
calor (heat) of acute inflammation is also due to
histamine-dependent arteriolar vasodilatation. Pain
(dolor) in acute inflammation is due to bradykinin
and PGE2. A bee sting is an example of a type
I hypersensitivity reaction. (inf200)
2. Acute inflammation-stasis
This slide shows a small venule filled with
neutrophils and red blood cells. There are also
red blood cells outside of the blood vessel which
represents diapedesis. Fluid (edema) has also
leaked out of the blood vessel which is the cause
of "stasis" of the red blood cells and causes the
neutrophils to begin to slow their passage through
the blood stream. This process of vasodilatation
and increased vascular permeability, due to
histamine, facilitates the adhesion of the
neutrophils to endothelial cells. (inf003)
3. Red blood cells-rouleau
This is a peripheral blood smear demonstrating
stacking of the red blood cells, a process called
"rouleau" formation. This process is secondary
to stasis of the blood flow and increased
concentrations of plasma proteins which coat the
red cells and cause them to stick together.
Rouleau causes an increase in the erythrocyte
sedimentation rate. (inf004)
4. Red blood cells-margination and
pavementing
This blood vessel against represents stasis of
blood flow with accumulation of red blood cells.
Notice that some of the neutrophils are lined up
Inflammation1
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along the endothelial surface of the vessel. This is
called "pavementing" and represents the
adhesion of the neutrophils to the endothelial
cells which is necessary prior to emigration of
the neutrophils out of the vessel. (inf005)
5. Neutrophils in acute inflammation
This is an area in the tissue where acute
inflammatory cells are accumulating. Chemotactic
substances (e.g. C5a, C3a, LTB4) draw these cells
into an area of damage so they can undergo the
process of phagocytosis. (inf007)
6. Peripheral blood smear-neutrophil
This slide shows a segmented neutrophil
(polymorphonuclear leukocyte). Normal cells
should have 3-5 lobes in the nucleus. Neutrophils
are the primary cell of acute inflammation.
(inf002)
7. Band neutrophil
This peripheral blood smear shows a band
neutrophil which is the precursor cell to the
segmented neutrophil. If the stimulus for storage
pool neutrophil release continues beyond a few
days, the post-mitotic pool will become depleted
(the production of acute phase reactants causes
release of the post-mitotic pool of neutrophils).
The mitotic pool will then increase production in
an attempt to meet the demand for neutrophils.
Greater than 10% band neutrophils or any
neutrophil less mature than a band
(metamyelocyte, myelocyte) in the peripheral
blood count is a "shift to the left". (inf013)
8. Monocytes
This slide shows two examples of monocytes in
peripheral blood. Once monocytes become
macrophages, they lose the 02 dependent MPO
system. (inf051)
9. Electron microscopy of macrophage
Inflammation1
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The nucleus is at the bottom of the slide. The dark
granules represent lysosomes. Recall that
macrophages used to be circulating monocytes.
Monocytes and macrophages are the primary cells
of chronic inflammation. (inf201)
10. Small lymphocyte
This slide shows a small lymphocyte with
approximately 90% of the cell being nucleus. The
chromatin in the nucleus is deeply condensed and
lumpy. (inf054)
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Inflammation 2
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Pathology I Images
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Inflammation
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11. Electron microscopy of a small lymphocyte
Note the condensed chromatin of the nucleus
surrounded by a thin rim of cytoplasm. Recall that
the majority of peripheral blood lymphocytes are T
cells (60-80%) with a 2:1 ratio of CD4 T helper
cells to CD8 suppressor/cytotoxic T cells. The
remaining lymphocytes are B cells. (inf202)
12. Peripheral blood: eosinophil and basophil
Cell number 1 is an eosinophil. Note that the
red granules are the same color as the RBCs.
Granules do not cover the nucleus. Eosinophilia
is associated with type I hypersensitivity
reactions- e.g., hay fever, allergic rhinitis,
bronchial asthma, invasive helminthic infections.
Cell number 2 is a basophil. Note that the
granules are darker than the RBCs and they cover
the nucleus. (inf204)
13. Electron microscopy of an eosinophil
Note the rod-shaped crystals in the granules.
When eosinophils degenerate, the crystals may
coalesce to form Charcot-Leyden crystals, a
characteristic finding in the sputum of asthmatics.
(inf205)
14. Bone: acute osteomyelitis (suppurative
inflammation)
Note the yellow area in the metaphysis of the
femur. This represents an area of acute
suppurative inflammation (liquefactive necrosis)
due to hematogenous spread of Staphylococcus
aureus, the MCC of acute osteomyelitis in
children. Neutrophils will lyse the bone and
produce a radiolucent area that is visible on x-ray
after one week. (inf206)
15. Face: erysipelas due to group A
streptococcus (Streptococcus pyogenes,
Inflammation 2
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cellulitis)
Note the raised, erythematous area involving most
of the left side of the face. Cellulitis is commonly
seen in streptococcal infections owing to the
production of hyaluronidase, which breaks down
GAGs and allows the infection to spread through
subcutaneous tissue. (inf207)
16. Pseudomembranous inflammation
This slide is from a case of diphtheria. Note the
gray membrane in the upper airway
(oropharynx). This membrane (pseudomembrane)
is composed of neutrophils, necrotic tissue, and
fibrinous exudate. It is characteristic of
diphtheria. The causative organism is
Corynebacterium diphtheriae, a gram positive rod.
The organism produces an exotoxin which
damages the myocardium and peripheral nerves.
Another type of pseudomembrane formation is
pseumembranous colitis which is caused by use of
antibiotics such as ampicillin. (inf028)
17. Colon: pseudomembranous colitis due to
Clostridium difficile (pseudomembranous
inflammation)
Note the gray-yellow pseudomembrane covering
the entire mucosal surface. Damage is due to a
toxin produced by C. difficile. Similar to
diphtheria, the toxin produces necrosis of the
mucosa and submucosa without actual invasion by
the bacteria. A toxin assay of stool is the best
method for diagnosing the disease. Ampicillin is
the MC drug causing pseudomembranous
colitis and does so by destroying colonic bacteria
that normally keep C. difficile in check. (gi269)
18. Granulomatous inflammation
This is another example of a granuloma. Note the
presence of multinucleated giant cells. Also note
that lymphocytes predominate in the areas
surrounding the granuloma. (inf061)
19. Granulomatous inflammation: Langhan's
giant cell
This slide shows a giant cell associated with an
area of granulomatous inflammation. Note that
the nuclei are arranged at the periphery of the
cell. This is a characteristic of Langhan's giant
cells. These cells are prominent in areas of
granulomatous inflammation but are not required
for a diagnosis. (inf063)
20. Heart: Fibrinous pericarditis
Inflammation 2
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Note the shaggy exudate surfacing the
pericardium. In this case, it is a sterile acute
inflammatory reaction due to acute rheumatic
fever. Increased vessel permeability causes
protein (includes fibrinogen) to leak out of the
vessels and congeal on the surface. Patients
develop an audible friction rub due to the
parietal pericardium separating away from the
visceral pericardium covered with the exudate
during different phases of the cardiac cycle. Other
causes of fibrinous pericarditis include SLE, a
transmural myocardial infarction, and coxsackie
virus pericarditis (MCC). (inf209)
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Neoplasia 1
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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It is against copyright laws to make
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1. Adrenal adenoma
This is an adrenal adenoma which is a
benign tumor arising from the adrenal
cortex. Notice how well-demarcated it is.
There is absence of hemorrhage and
necrosis. It also has the color of adrenal
cortex. (Neo001)
2. Tubular adenoma
This is a microscopic section of a neoplastic
polyp arising from the colon mucosa. The
polyp is pedunculated and is composed of
colonic glands which have lost many of the
normal goblet cells. This is called an
adenomatous change. (Neo003)
3. Squamous cell carcinoma
This is a cluster of malignant squamous
cells. These malignant cells are still able to
undergo some degree of differentiation as
shown by the pink area of keratinization.
(Neo004)
4. Adenocarcinoma
This is a slide showing malignant gland
formation. The nests of malignant cells are
producing gland lumina. The clear areas on
the left represent mucin production by the
tumor cells. (Neo005)
5. Transitional cell carcinoma of the
Neoplasia 1
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urinary bladder
This slide shows a papillary projection from a
bladder cancer. Each side of the papillary
process is lined by several layers of
transitional cells. This tumor is graded by
the number of cell layers (stratification)
present. (Neo006)
6. Lipoma
The yellow mass with the muscle is a benign
tumor arising from mature adipose tissue.
The tumor is well-circumscribed. (Neo007)
7. Leiomyoma of stomach
This is a gross photograph of a benign tumor
of smooth muscle origin in the stomach.
These tumors may present with bleeding.
(Neo008)
neo010.jpg (9415 bytes) 8. Embryonal rhabdomyosarcoma
This slide shows a striated malignant tumor
cell (strap cell). This type of
rhabdomyosarcoma is the MOST COMMON
sarcoma of children. It arises in the vagina
in girls and in the urethra of boys. It is
desmin positive. (Neo010)
9. Cystic teratoma (dermoid cyst)
This is a benign teratoma arising from all
three germ cell layers. It is typically
composed of ectodermally derived hair and
sebaceous secretions. These tumors
frequently make tooth structures. The
tumors arise in gonads or as midline
lesions. In children, they are found in the
sacrococcygeal area. (Neo011)
10. Mixed tumor of the parotid
These tumors are considered the MOST
COMMON type of salivary gland tumor. They
arise from the same germ cell layer but
there are two distinct types of histologic
patterns within the tumor. These tumors
Neoplasia 1
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usually have a glandular type of tissue plus a
myxoid stroma. (Neo012)
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Neoplasia 2
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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11. Malignant lymphoma
This slide shows diffuse involvement of the
mediastinum by a tan "fish-flesh" mass.
This is a classic pattern seen in malignant
lymphomas involving this area. The tumor
arises from solid lymphoid tissue. (Neo013)
12. Hodgkin's disease
This slide shows bilateral cervical
lymphadenopathy. This pattern is common
in Hodgkin's disease which is a subtype of
lymphoma. (Neo015)
13. Hodgkin's disease - Reed-Sternberg
cells
These microscopic sections show large cells
with prominent eosinophilic nucleoli called
Reed-Sternberg cels. These cells are most
commonly found in mixed cellularity
Hodgkin's disease and lymphocyte-depleted
Hodgkin's disease. Both of these histologic
patterns have a less favorable prognosis than
lymphocyte-predominant Hodgkin's or
nodular sclerosing Hodgkins's which is the
most common type. (Neo016)
14. Acute lymphocytic leukemia
This is a peripheral blood smear showing a
cluster of immature appearing lymphocytes
(lymphoblasts). This tumor is the most
common leukemia of children with the peak
age being 4. The CALLA antigen is a tumor
marker which is found on pre-B cells and
gives a favorable prognosis. The bone
marrow would show > 30% blast forms.
(Neo017)
Neoplasia 2
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15. Chronic lymphocytic leukemia
This is the most common leukemia in elderly
patients. Notice the mature appearing B
lymphocytes in the peripheral blood smear.
These B cells are long-lived and
nonfunctional and infiltrate the bone marrow,
blood, lymph nodes, and other tissues.
(Neo018)
16. Acute myeloblastic leukemia
Note the eosinophilic rod-shaped structures
in the cytoplasm of the neoplastic cells.
These are AUER rods and are present in
most cases of AML especially the
promyelocyte class. There are 8 classes of
AML, each with unique features. Acute
promyelocytic leukemia is associated with a t
(15;17) translocation and disseminated
intravascular coagulopathy is common.
(Neo019)
17. Bronchial hamartoma
This is a non-neoplastic lesion composed of
tissues normally found in the organ where
the hamartoma arises. The tissues in the
hamartoma are typically disorganized in their
arrangement. (Neo020)
18. Peutz-Jeghers
This is a syndrome associated with
mucocutaneous pigmentation and
hamartomatous polyps of the GI tract.
(Neo021)
19. Hyperplastic polyps
These are hamartomatous polyps of the GI
tract which are the MOST COMMON type of
non-neoplastic polyp. Microscopically, they
show increased numbers of goblet cells.
(Neo022)
20. Choristoma (heterotropic pancreas)
This is a section of duodenum showing an
aggregate of pancreatic tissue in the wall.
The pancreatic tissue is normal in
appearance but in an abnormal location.
This is a non-neoplastic process. (Neo023)
Neoplasia 2
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Neoplasia 3
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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21. Hemangioma
This is a benign neoplasm arising from
endothelial cells of blood vessels. (Neo024)
22. Hemangioma
This is the microscopic appearance of a
hemangioma showing dilated blood vessels
filled with red blood cells and lined by benign
endothelial cells. (Neo025)
23. Malignant cells
This slide shows several features of
malignancy. The cell in the central portion
of the slide shows a TETRAPOLAR mitotic
figure which is abnormal. Other cells show
hyperchromatic nuclei or large and irregular
nuclei and nucleoli all of which are features
of malignancy. (Neo026)
24. Retinoblastoma
This is a retinoblastoma. This malignant
tumor is associated with inactivation of the
Rb tumor suppressor gene. (Neo027)
25. Burkitt's lymphoma
This lymphoma, especially the African type,
Neoplasia 3
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is associated with a 8;14 chromosomal
translocation. (Neo028)
26. Kaposi sarcoma
Multiple vascular lesions are noted. This
tumor is associated with HIV and arises from
endothelial cells. There is a high correlation
with Kaposi sarcoma herpesvirus (KSHV) or
human herpesvirus-8 (HHV-8) (Neo029)
27. Xeroderma pigmentosum
This autosomal recessive disorder involves a
defect in DNA repair enzymes in the skin.
The patients are susceptible to skin cancers
such as melanomas, basal and squamous cell
carcinomas of the skin associated with UVB
light damage. (Neo030)
28. Squamous cell carcinoma of skin
This neoplasm is associated with UVB light
damage and immunosuppression. It is found
on sun-exposed areas, particularly the face.
(Neo031)
29. Clear cell carcinoma of the vagina
Diethylstilbestrol exposure. This is a
malignant neoplasm occurring in the vagina
of the daughters of DES exposed mothers.
Neoplasia 3
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The DES causes persistence of Mullerian
tissues in the vagina which gives rise to
vaginal adenosis which is the precursor
lesion for clear cell adenocarcinoma. This
tumor occurs in young females. (Neo032)
30. Asbestos (ferrunginous bodies)
bodies
These dumbbell shaped particles are found
in the lungs of patients exposed to asbestos.
Pleural fibrous plaques and malignant
mesotheliomas are associated with exposure
to asbestos. (Neo034)
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Neoplasia 4
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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31. Pleural mesothelioma
This neoplasm arises from mesothelial cells
of the pleura and peritoneum. It encases
the lung-producing compressive atelectasis.
Prior asbestos exposure is the major risk
factor. (Neo035)
32. Metastasis
Each of the organ systems featured on the
slides represent favored sites for metastasis.
The bone is a common site for metastasis
from prostate, lung, and thyroid cancers.
CNS is a common site of metastasis from
small cell carcinomas of lung and breast
cancers. Liver is a common site of
metastasis from lung and colon tumors.
(Neo036)
33. Metastasis
The lung is a common site of metastasis
from colon and other visceral neoplasms.
"Cannon-ball" metastasis is produced by
hematogenous spread of choriocarcinoma,
osteogenic sarcomas, and renal cell
carcinoma. (Neo037)
34. Lymphangitic spread
This slide shows a lymphatic vessel
containing nests of malignant
adenocarcinoma cells. (Neo038)
35. Lymph node metastasis
This is an example of a papillary carcinoma
Neoplasia 4
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of the thyroid which has metastasized to a
lymph node. (Neo039)
36. Omental seeding
This section of omental fat shows light tan
tumor masses which are adherent to the
omentum. Tumors associated with this type
of seeding include mucinous cystadenocarcinomas
of the ovary, and tumors of the
GI tract. (Neo040)
37. Vascular invasion-follicle carcinoma
of the thyroid
This tumor has the propensity to invade
blood vessels and undergo hematogenous
dissemination which is shown on the slide.
(Neo041)
38. Osteoblastic metastasis
Certain neoplasms have a tendency to
metastasize to bone and if so, produce
stimulation of the osteoblasts with new bone
formation. The bone alkaline phosphatase
will be elevated in the serum. Tumors
associated with osteoblastic metastasis
include prostate, thyroid, breast, and
carcinoid. (Neo042)
39. Osteolytic metastasis
Tumors which metastasize to bone and
cause bone breakdown include breast and
lung. Pathologic fractures are a risk.
(Neo043)
40. Lung radiographics showing cancer
The top radiograph shows a peripheral
density in the right lung which represents a
primary adenocarcinoma of the lung. The
lower radiograph shows "cannon-ball"
metastasis. (Neo044)
Neoplasia 4
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Neoplasia 5
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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It is against copyright laws to make
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41. Well-differentiated squamous cell
carcinoma
This slide shows two nests of welldifferentiated
squamous cells (low grade)
demonstrating features of normal squamous
cells. (Neo045)
42. Well-differentiated adenocarcinoma
This slide shows a well-differentiated
adenocarcinoma with well formed glands and
distinct lumens. (Neo046)
43. Hypertrophic osteo-arthropathy
This is a paraneoplastic syndrome
characterized by clubbing of the fingers, toes
and periosteal elevation of the distal parts of
the long bones. It is associated with lung
cancer. (Neo048)
44. Acanthosis nigricans
A paraneoplastic syndrome of
hyperpigmentation of the axilla associated
with an underlying gastric carcinoma. A
phenotypic marker. (Neo049)
45. Seborrheic keratosis (Leser Trelat)
Neoplasia 5
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A paraneoplastic syndrome associated with
sudden appearance of multiple crops of
seborrheic keratoses-a pigmented skin lesion
with a "stuck-on" appearance. Associated
with underlying GI cancer. (Neo050)
46. Marantic endocarditis
Endocarditis associated with sterile
vegetations that are thought to be due to a
hypercoagulable state. (Neo051)
47. Barrett's esophagus-mucin stain
This is a metaplastic change in the
esophagus associated with reflux
esophagitis. The normal squamous
esophageal mucosa is replaced by gastric
glandular mucosa. It is a precursor lesion
for adenocarcinoma of the esophagus.
(Neo052)
48. CIN I (Cervical Intraepithelial
Neoplasia I)
The is mild dysplasia of the cervix. Notice
that the basal cell layer now composes the
lower 1/3 of the cervical mucosa. (Neo053)
49. CIN III
This is severe dysplasia of the cervix. The
basal cells now occcupy 2/3 to 3/4 of the
mucosal thickness. These cells show atypical
features with pleomorphism and
hyperchromatic nuclei. Three mitotic figures
are noted. (Neo054)
50. Squamous cell carcinoma of the
larynx
Note the fungating mass on the lateral
border of the larynx with central ulceration.
These tumors are associated with smoking
and chronic alcohol use. The first symptom
is hoarseness. (Neo056)
Neoplasia 5
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Neoplasia 6
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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It is against copyright laws to make
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51. Two radiographs with cancers
The x-ray on the left shows a large upper
lobe peripheral lesions of the left lung. This
is most likely an adenocarcinoma. The x-ray
on the right shows a central density in the
right lung which is most likely a squamous
cell carcinoma. (Neo057)
52. Squamous cell carcinoma of the lung
This slide shows an airway that is opened.
The mucosa appears rough and there is an
infiltrating mass involving the wall of the
bronchi before and after the branching.
This is most likely a squamous cell
carcinoma. (Neo058)
53. Squamous cell cardinoma-lungcytology
These three photographs of cytologies show
malignant squamous cells. Note the
"organophilic" cytoplasm which represents
keratin and the increased nuclear to
cytoplasmic ratio. The cells in one slide are
in a nest. The nuclei are hyperchromatic,
irregular, and have prominent nucleoli.
(Neo059)
54. Small cell carcinoma of lung
The slide on the left is a sputum cytology
showing small dark staining cells. They
mold around each other. There is almost no
cytoplasm visible. The slide on the right is
from the tumor in the lung. Notice the
hyperchromatic cells which appear to be
swarming around the blood vessels. This
tumor has the highest association with
smoking and the worse prognosis. It is
more common in men. (Neo060)
55. Squamous cell carcinoma of lung
Neoplasia 6
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with associated findings
This slide shows a large central arising
squamous cell. The upper lobe which
appears dark demonstrates atelectasis from
complete obstruction of the airway lumen by
the cancer. Another lobe shows markedly
dilated airways representing bronchiectasis
with mucous plugs. This associated with
incomplete obstruction of a proximal airway.
The other lobe shows consolidation
consistent with either golden pneumonia
(endogenous lipid pneumonia) or a bacterial
pneumonia secondary to incomplete
obstruction. (Neo061)
56. Superior vena cava syndrome
This patient shows obstruction of the venous
supply from the head and neck with
distention of the neck veins. This is due to
a neoplasm infiltrating the mediastinum and
obstruction of the superior vena cava.
(Neo062)
57. Horner's syndrome
This patient shows ptosis and miosis of the
right eye due to involvement of the
ipsilateral cervical sympathetic chain by local
lung cancer extension. (Neo063)
58. Leukoplakia and invasive cancer
The slide on the right shows white patches
consistent with leukoplakia, a premalignant
change of the oral mucosa and tongue
associated with either smokeless tobacco use
or chronic irritation. The slide on the left
shows a tongue with leukoplakia as well as
invasive cancer (patient's right side of
tongue). (Neo064)
59. Squamous cell carcinoma of lower lip
This patient has an ulcerated lesion of the
left lower lip which is most likely a
squamous cell carcinoma. The associations
are pipe smoking and sun exposure.
(Neo065)
60. Squamous cell carcinoma of
esophagus
Neoplasia 6
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This tumor typically arises in the middle third
of the esophagus and infiltrates the wall.
The most common symptom is dysphagia,
first for solids and then both liquids and
solids. (Neo066)
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Neoplasia 7
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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It is against copyright laws to make
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61. Squamous cell carcinoma of
esophagus
This tumor has invaded the walls of local
structures around the esophagus and
infiltrates the wall. The most common
symptom is dyphagia, first for solids and
then both liquids and solids. (Neo067)
62. Linitis plastica (adenocarcinoma of
the stomach (signet ring carcinoma)
This tumor invades the wall of the stomach
producing a desmoplastic response. The
stomach becomes hard like a leather bottle.
This tumor presents late in its course and
has a tendency to metastasize to the
ovaries. (Neo068)
63. Krukenberg's tumor
This is a mucin stain of signet ring cells in
the ovary. The tumor is a metastatic gastric
carcinoma which has spread to the ovaries.
(Neo069)
64. Carcinoid tumor of the appendix
This is the most common location of an
asymptomatic carcinoid tumor. The tumor
arises in the tail of the appendix from
resident neuroendocrine cells (APUD cells).
It is usually an incidental finding in this
location. (Neo070)
65. Carcinoid tumor-neurosecretory
granules
Neoplasia 7
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The arrows point to dark staining
cytoplasmic organelles which are features of
neuroendocrine tumors. (Neo071)
66. Familial polyposis
This autosomal dominant condition is
associated with multiple tubular adenomas
and tubulovillous tumors in the colon. The
patient has > 100 polyps and is at risk for
colon cancer. There is an association with
the APC tumor suppressor gene. (Neo072)
67. Tubular adenoma
There are four slide demonstrating a tubular
adenoma. The slide on the upper left is a
endoscopic view of the pedunculated tumor.
A barium outlines the polyp. The last two
slides show the pedunculated polyp. There
is a slight risk of malignant transformation
with tubular adenomas. (Neo073)
68. Villous adenoma
This is a microscopic section of a villous
adenoma. Note the long stalk-like papillary
projections of the tumor. These tumors are
typically sessile and have a high incidence of
malignant transformation. (Neo074)
69. Adenocarcinoma of colon
This tumor is a fungating mass with central
necrosis which arises from colonic mucosa.
It tends to infiltrate the wall of the colon in a
"napkin-ring" fashion producing obstruction.
Obstructive lesions occur in the descending
colon. (Neo075)
70. Adenocarcinoma of the colon
This lesion is growing as a polypoid mass
into the lumen of the ascending colon. Right
sided colonic masses typically present with
anemia and bleeding. (Neo076)
Neoplasia 7
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Neoplasia 8
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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71. Hepatocellular carcinoma
This tumor arises from hepatocytes.
Conditions which predispose to this tumor
include post-necrotic (post-infectious)
cirrhosis, pigment cirrhosis (hemosiderosis),
alcoholic cirrhosis, aflatoxins, and thorotrast.
(Neo077)
72. Metastasis to the liver
This liver shows numerous nodules, some
having an umbilicated center, which are
metastatic tumors. The metastasis is most
likely from lung, breast, or GI tract.
(Neo078)
73. CT of liver with metastasis
The CT shows radiolucent areas in the liver
consistent with metastatic nodules.
(Neo079)
74. Cholelithiasis and carcinoma of
gallbladder
This slide shows a gallbladder that is thin
and fibrotic. One portion of the gallbladder
wall shows a tan mass of tumor which
infiltrates the attached tissues. Gallbladder
cancer may arise in a setting of chronic
cholecystitis and cholelithiasis. (Neo080)
75. Carcinoma of the pancreas
The head of the pancreas shows a large
Neoplasia 8
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tumor mass which is infiltrating the wall of
the duodenum. This lesion will likely
produce obstructive jaundice. A marker for
the tumor is CA 19-9. (Neo081)
76. Renal cell carcinoma
This tumor arises from proximal tubular cells
in the kidney and is typically in the upper
pole of the kidney. It will be very vascular.
The tumor presents with hematuria, flank
mass, flank pain, or with paraneoplastic
hormone production. The tumor tends to
invade the renal vein and spread to the
lungs with cannon-ball metastasis.
(Neo082)
77. Wilm's tumor
This tumor arises in young children from
renal primordial rests. It has tissues from
two germ cell layers. Patients present with
a flank mass and hypertension. (Neo083)
78. Transitional cell carcinoma
Neoplasia 8
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This slide shows a papillary tumor by
cytoscopy. It is arising from the transitional
mucosa of the bladder and usually presents
with hematuria. (Neo084)
79. Carcinoma of prostate
This is an adenocarcinoma arising in the
posterior lobe of the prostate. It produces a
"stony-hard" consistency to the prostate on
rectal exam and is painless. (Neo085)
80. Prostate chips
These are fragments of prostate tissue
removed by the TURP procedure
(transurethral prostatic resection). Each
piece of tissue will be examined
microscopically after they are weighed
collectively. (Neo086)
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Neoplasia 10
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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It is against copyright laws to make
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91. Leiomyosarcoma
This is the most common sarcoma of the
female genital tract, although rare. It
usually arises de novo. It is bulky and
hemorrhagic. Microscopic grading is based
on the numbers of mitoses counted per high
powered field. (Neo097)
92. Papillary serous cystadenocarcinoma
of ovary
This is the most common malignant ovarian
tumor and has a high incidence of
bilaterality. The tumor is derived from the
surface epithelium of the ovary and the cells
of the tumor resemble fallopian tube lining
cells. The most solid areas of the tumor are
associated with a higher grade of tumor.
(Neo098)
93. Papillary serous cystadenocarcinoma
of ovary
This tumor is malignant and is one of the
four ovarian tumors associated with
calcification. The calcification are called
Psammoma bodies. A marker for this tumor
is CA-125. (Neo099)
94. Cystic teratoma
This is the most common germ cell tumor of
the ovary. It is benign and consists of
structures derived from all three germ cell
layers. The tumor frequently contains
calcified tooth structures as well as hair and
other structures derived from ectoderm.
(Neo100)
95. Cystic teratoma
This teratoma is producing skin, sebaceous
Neoplasia 10
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glands, bronchial mucosa and cartilage.
(Neo101)
96. Struma Ovarii
This is a specialized teratoma which is
producing thyroid tissue which is frequently
functional. (Neo102)
97. Schiller-Duval body (yolk sac tumor
or endodermal sinus tumor)
This tumor derives from germ cell in the
testis and ovary and is the most frequent
testicular tumor in children. A marker of the
tumor is a cluster of tumor cells surrounding
a small blood vessel. This is the Shiller-
Duval body. The tumor produces alpha- 1
antitrypsin and alpha-fetoprotein. (Neo103)
98. Meig's syndrome
Ovarian fibromas associated with a right
sided pleural effusion and ascites is MEIG's
syndrome. (Neo104)
99. Hydatidiform mole
Note the multiple-grape-like clusters
associated with this neoplasm. Moles can be
complete or partial. A complete mole has no
embryo, a 46 XX or 46XY genotype, and is
associated with choriocarcinoma. An
incomplete mole has an associated embryo,
69XXY, and rare association with a
choriocarcinoma. (Neo105)
100. Choriocarcinoma
Multiple slides show an invasive
choriocarcinoma. This tumor is very
aggressive and arises from gestational
trophoblastic epithelium. It is common in
the Asian population. No chorionic villi are
formed, only cytotrophoblast and
Neoplasia 10
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syncytiotrophoblast tissues. (Neo106)
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Neoplasia 11
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
1 | 2 | 3| 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13| 14
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101. Fibroadenoma of breast
This tumor occurs in young females, is wellcircumscribed,
firm, and movable. It is
composed of ductal epithelium and
connective tissue. (Neo107)
102. Positive mammogram
Note the density in the left mammogram
which has irregular margins and small
calcifications. This is consistent with a
neoplasm in the breast. (Neo108)
103. Adenocarcinoma of the breast
Note the area of increased density and
retraction surrounded by fat. This is an area
of scirrhous cancer or infiltrating ductal
carcinoma of the breast. It produces
retraction of the skin overlying the lesion.
(Neo109)
104. Infiltrating ductal carcinoma of
breast
Note the tumor cells occurring in cords and
nests. This type of infiltrating pattern causes
desmoplasia which then leads to the firm
fixed texture of the tumor. (Neo110)
105. Infiltrating ductal carcinoma of
breast (cribiform pattern)
Neoplasia 11
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Note the collections of tumor cells with a
"gland within gland" pattern. This is one of
the histologic features seen in
adenocarcinoma of the breast. (Neo111)
106: Comedocarcinoma of breast
This is a type of ductal cancer where the
tumor is present within the ducts
(intraductal) and has not infiltrated the
surrounding tissues. The central area of the
ducts is necrotic. This is the comedo
pattern or pimple. (Neo112)
107: Inflammatory carcinoma of breast
Note how the left breast appears inflamed,
edematous, and enlarged. This is
inflammatory carcinoma which is a subtype
of infiltrating ductal carcinoma. It is a very
aggressive tumor with infiltration into
lymphatics. (Neo113)
108. Inflammatory carcinoma with
dermal lymphatic invasion
Note the nests of tumor cells within the
dermal lymphatics of the breast. This is a
poor prognostic sign. (Neo114)
109. Paget's disease
This is an eczematous scaly lesion of the
breast which represents invasion of the
nipple by adenocarcinoma cells. There will
always be an underlying intraductal
carcinoma of the breast. (Neo115)
110. Lobular carcinoma
The lobules are filled with monotonous
appearing tumor cells. The entire lobule is
involved but there is no spread into the
surrounding tissue so this is Lobular
carcinoma in situ. (Neo116)
Neoplasia 11
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Neoplasia 12
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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111. Lymphedema
This patient has had a radical mastectomy
where all of the axillary lymph nodes were
removed as well as all of the breast tissue
down to the chest wall. These patients have
very poor lymphatic drainage of the
dependent extremity and are at risk for
developing a lymphangiosarcoma. (Neo117)
112. MRI of pituitary adenoma
Notice the midline density below the
hypothalamus. This is consistent with a
benign tumor of the pituitary gland. Many of
these tumors are functional. The most
common functional pituitary adenoma is a
prolactinoma. (Neo118)
113. Pituitary adenoma
Notice the midline density below the
hypothalamus. This is consistent with a
benign tumor of the pituitary gland. Many of
these tumors are functional. The most
common functional pituitary adenoma is a
prolactinoma. (Neo119)
114. Craniopharyngioma
A large cystic mass is noted in the midline.
These lesions frequently calcify. They arise
from Ratke's pouch remnants and are the
most common cause of hypopituitarism in
children. (Neo120)
115. Carcinoma of thyroid
A large yellow mass is noted in the right
Neoplasia 12
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lobe of the thyroid. It appears to be
infiltrating the thyroid. This would likely be
a "cold" nodule on a radionucleotide scan.
(Neo121)
116. Papillary carcinoma of thyroid
Note the papillary projections produced by
this tumor. There are calcifications in the
tumor called Psammoma bodies. This tumor
tends to invade through the lymphatic
sytem. It is associated with prior radiation
exposure to the head and neck. (Neo122)
117. Medullary carcinoma of thyroid
This tumor arises from C cells of the
thyroid. The stroma of the tumor is
comprised of calcitonin derived
amyloid. (Neo123)
118. Neuroblastoma
This is a small cell tumor arising from the
medullary portion of the adrenal or other
sites in the sympathetic nervous system. It
is one of the most common extracranial
childhood solid tumors. The circular
structures within the tumor are called
Homer-Wright pseudorosettes. A marker is
the n-myc oncogene. (Neo124)
119. Osteogenic sarcoma
This tumor arises from bone forming cells.
Excluding multiple myeloma, it is the most
common primary malignant tumor of bone.
It usually occurs in the second decade of
life. Most common site is in the area around
the knee. It may occur in an older age
group in association with Paget's disease of
bone. (Neo125)
120. Radiograph of osteogenic sarcoma
showing "sunburst"
The tumor typically is large and ill-defined
and characteristically destroys the cortex
with extension inward into the marrow cavity
and outwards into adjacent soft tissues.
(Neo126)
Neoplasia 12
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Neoplasia 13
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Neoplasia
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121. Chrondrosarcoma
This tumor arises from mesenchymal cells
that produce a cartilaginous matrix.
Chrondrosarcomas occur in older patients
with a peak incidence in the sixth decade.
These tumors arise in central portionsof the
skeleton such as the shoulder area, pelvis,
proximal femur, and ribs. (Neo127)
122. Actinic Keratosis
This is a premalignant lesion of the skin
associated with excessive sun exposure.
There is excess of keratin (hyperkeratosis)
but the epidermis is thinner than normal.
The stratum corneum is thickened and,
unlike normal skin, the nuclei in the cells in
this layer are retained (parakeratosis). The
elastic tissue fibers in the dermis are
thickened, and bluish-gray (elastosis).
(Neo128)
123. Basal cell carcinoma
This tumor is associated with sun exposure.
They are typically "pearly grey" papules on
the side of the nose or upper lip. They
rarely, if ever, metastasize. (Neo215)
124. Basal cell carcinoma
This is a microscopic section of a basal cell
carcinoma showing the tumor cell nests.
The peripheral group of cells in a nest are
oriented perpendicular to the rest of the
cells similar to a picket fence. (Neo130)
125. Nevocellular nevus:
Neoplasia 13
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This is a pigmented lesion arising from the
melanocytes in the skin. Pigmentation is
generally uniform and the lesions have welldefined
rounded borders. They are benign
lesions. (Neo131)
126. Melanoma
This is a malignant tumor arising from
melanocytes. A superficial spreading
melanoma has a variegated pigment pattern
and tends to spread along the epidermaldermal
junction in a radial or horizontal
growth phase for a number of years before
vertical growth begins. Superficial spreading
melanomas are macules or flat and are the
most common type of melanoma. They
occur most commonly on women's legs and
men's torsos. It is usually smaller then
lentigo meligna melanoma. Pigmentation is
ofter red, white, and blue, sometimes with
raised, indurated edges. A nodular
melanoma has only a vertical growth phase
and has the worse prognosis. A vertical
growth phase is signaled by a papule or
nodular appearance to a melanoma.
(Neo132)
127. Malignant melanoma
This is a microscopic section of a superficial
spreading melanoma showing the nests of
nevus cells in the epidermis and dermis.
These cells do not metastasize. If the tumor
begins a vertical growth phase, then the
tumor cells can metastasize. (Neo133)
128. Lentigo meligna melanoma
This type of melanoma typically occurs on
the face in sun exposed areas in elderly
patients. Malignant melanocytes invade the
dermis. The lesions appear as flat, tan or
brown macules with darker brown or black
spots scattered irregularly on the surface of
the lesion. (Neo134)
129. Subungual acrolentiginous
melanoma
This is an uncommon type of melanoma
which is the most common form found in
blacks. It arises on palmar, plantar, and
subungual skin and histologically resembles
lentigo maligna melanoma. (Neo129)
Neoplasia 13
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130. Astrocytoma
The left side of the cortex shows loss of the
normal demarcation between grey and white
matter. This is an area where the tumor has
infiltrated the brain tissue with indistinct
margins. Astrocytomas are the most
common histologic type of primary brain
tumors. They occur in the supra tentorial
areas in adults and in the cerebellum in
children. (Neo136)
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Nutrition 1
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Pathology II Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Nutrition
It is against copyright laws to make
electronic or printed copies of these slides!!
1. Patient with
bulimia:
Note the brown
areas of
discoloration on the
teeth that represent
acid injury to the
enamel from
repeated selfinduced
vomiting.
The brown color is
the underlying
dentine of the
tooth. (Nut201)
2. Obesity:
Obesity is defined
as a body mass
index (BMI) > 30
kg/m2: weight in
kilograms divided
by the height in
meters squared.
Morbid obesity is a
BMI > 40 kg/m2.
Hypertension is the
MC complication of
obesity. (Nut202)
Nutrition 1
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3. Child with
kwashiorkor:
Kwashiorkor is
defined as a
decreased protein
intake in spite of a
normal caloric
intake consisting
primarily of
carbohydrates. Note
the pitting edema
in the legs
(decreased serum
albumin), flaky
paint dermatitis on
Nutrition 1
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the legs,
protuberant
abdomen (fatty
liver from
decreased
apolipoprotein
synthesis and
ascites). (Nut003)
4. Child with
marasmus:
Marasmus is a total
calorie deprivation.
Note the monkey
like facies and
broomstick
extremities.
(Nut004)
5. Eye in vitamin
A deficiency:
Recall that vitamin
A prevents
squamous
metaplasia.
Squamous
metaplasia of
corneal epithelium
leads initially to
focal white patches
on the cornea
(noted in multiple
places in the eye)
called Bitot's spots.
(Nut205)
6. Eye in vitamin
A deficiency:
Nutrition 1
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Extensive
replacement of the
corneal epithelium
by squamous
epithelium leads to
corneal softening
(keratomalacia),
ulcers, infection,
and, ultimately,
blindness. Vitamin A
is the second MCC
of global blindness,
the first being
trachoma due to
Chlamydia
trachomatis.
(Nut006)
7. Patient with
vitamin A
deficiency:
Note the "goosebump"
appearance
of the back of the
arm in this patient.
This represents
follicular
hyperkeratosis,
which is an
increase in
squamous
epithelium in the
hair follicles.
(Nut206)
8. Child with
rickets:
rickets is most
commonly due to
vitamin D
deficiency. Osteoid
and cartilage do not
get mineralized
properly. The soft
bone leads to
pathologic fractures
and bowing of the
legs, as
demonstrated in
this child.
(Nut008)
Nutrition 1
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9. Patient with
periorbital
hemorrhage from
vitamin K
deficiency related
to excess
warfarin:
Vitamin K deficiency
leads to a
hemorrhagic
diathesis, since the
vitamin K
dependent factors
are not gcarboxylated.
This
patient experienced
hemorrhage into
the loose
subcutaneous tissue
around the eye.
Recall that warfarin
inhibits epoxide
reductase,
therefore, vitamin K
is in the inactive K2
form rather than
the active K1 form.
(Nut009)
10. Newborn
brain with
hemorrhagic
disease of the
newborn from
vitamin K
deficiency:
Newborns who are
not given
intramuscular
vitamin K at birth
Nutrition 1
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experience a drop
in vitamin K levels
between the 3rd to
5th day, since they
do not have colonic
bacteria to
synthesize the
vitamin that early
in life. One
disastrous
complication of this
is cerebral
hemorrhage, as
demonstrated in
this slide.
(Nut010)
11. Skin findings
in vitamin C
deficiency
(scurvy):
The photo on your
left depicts
corkscrew hairs.
The photo on your
right exhibits
pinpoint
hemorrhages
around the hair
follicle (perifollicular
hemorrhage)
related to weak
collagen tissue in
small vessels with
subsequent rupture
around the follicles.
(Nut208)
12. Patient with
scurvy:
Note the smooth,
red tongue
(glossitis) and the
poor dentition, the
latter due to weak
collagen in the
gums and lamina
dura around the
teeth. This leads to
gingivitis, bleeding
gums (especially
after brushing the
teeth), and the loss
of teeth. (Nut207)
Nutrition 1
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13. Patient with
thiamine
deficiency and
foot drop:
Note how the foot
drops. This is due
to a peripheral
neuropathy
involving the
common peroneal
nerve. Recall that
thiamine catalyzes
reactions that are
important in the
synthesis of ATP.
ATP depletion leads
to wet and dry
beriberi. In addition
to Wernicke's
encephalopathy,
peripheral
neuropathy is a
manifestation of dry
beriberi. (Nut013)
14. Patient with
thiamine
deficiency and
pitting edema:
Note the dependent
pitting edema in
this patient. This
patient has wet
beriberi with
Nutrition 1
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congestive
cardiomyopathy and
both left and right
heart failure, the
latter responsible
for the pitting
edema. (Nut014)
15. Patient with
pellagra (niacin
deficiency):
This patient
demonstrates the
hyperpigmentation
of the skin in sun
exposed areas
(dermatitis). Note
the
hyperpigmentation
of the skin of the
hands and around
the neck, the latter
called Casal's
necklace.
(Nut015)
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Hematology1
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Hematology
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11
It is against copyright laws to make
electronic or printed copies of these slides!!
1. Normal PB smear and schematic of
mature RBC
Note that RBCs are a biconcave disc. Since
less Hb is concentrated in the area of
depression in the membrane, it appears
pale when flat on a slide, hence the
central area of pallor. If the central area
of pallor expands, then there is a problem
with Hb synthesis, which implicates one of
the microcytic anemias. If the cell is a
spherocyte, there is no central area of
pallor. If there is excess membrane, there
is a bulge in the center of the cell
collecting more Hb, hence the appearance
of a target cell. Mature RBCs do not have
mitochondria and use glucose for a fuel
(anaerobic glycolysis). (Hem001)
2. Asymptomatic patient
This is a normal smear. Note the
uniformity of the RBCs, the normal
amount of central pallor, and the
compression pallor induced by platelets
sitting on top of the RBC membrane. This
can be confused with malarial ring forms.
(Hem003)
3. Supravital stain of RBCs in an
asymptomatic person
Two reticulocytes are present in the slide.
Reticulocytes are RBCs that within 24
hours will be changed into a mature
biconcave disc by macrophages in the
spleen. The supravital stain identifies RNA
filaments, indicating that the cell is still
synthesizing Hb. The reticulocyte count is
the most important test to order after
identifying an anemia since it tells the
clinician how the bone marrow is
responding to the anemia. (Hem004)
4. Reticulocyte stain
Note the RNA filaments in these young
RBCs. (Hem200)
Hematology1
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5. PB in a 9 year old child with bthalassemia
major and a severe
microcytic anemia and elevated
reticulocyte count
The arrow points to a marrow reticulocyte
or shift cell, which, unlike a peripheral
blood reticulocyte, requires 48-72 hours
before it becomes a mature RBC and has
a bluish discoloration (polychromasia). In
severe thalassemia, the excess production
of a-chains are toxic to RBCs causing a
hemolytic anemia. Stimulation of marrow
erythropoiesis causes the release of
polychromasia cells as well as nucleated
RBCs. In a reticulocyte count, the count
must first be corrected for the degree of
anemia and then further corrected (divide
by 2) if polychromasia is present, since
they have RNA filaments like PB
reticulocytes and would falsely increase
the reticulocyte count. (Hem005)
6. Normal bone marrow
Note the proportion of cells to fat is ~70
cells to 30 fat. Large cells are
megakaryocytes. Cells with round nuclei
are either nucleated RBCs or young
neutrophils (myelocytes, etc). Cells with
"squiggly" nuclei are segmented
neutrophils and bands. The normal
myeloid to erythroid ratio is usually 3/1
indicating more WBCs than RBCs in the
marrow. (Hem006)
7. Patient with anemia and jaundice
What is the most likely diagnosis?
This child most likely has sickle cell
disease. Note the pallor of the lips, scleral
icterus, and chipmunk facies (prominent
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zygomatic bones) due to marrow
expansion from excessive erythropoiesis.
Sickle cells are removed by macrophages,
hence releasing large amounts of
unconjugated bilirubin. (Hem007)
8. Skull x-ray from a child with sickle
cell disease
Note the expansion of the marrow cavity
in the skull giving it a "hair on end"
appearance. Frontal bossing and
prominence of the zygomatic bone is also
noted. These changes occur owing to
massive erythropoiesis in the bone
marrow and indicate a severe hemolytic
anemia (e.g., sickle cell disease,
thalassemia major). (Hem008)
9. Patient with a severe anemia. What
is the most likely diagnosis?
She has a classic chipmunk face from
prominence of her zygomatic bones. This
indicates expansion of the marrow space
by a brisk erythropoiesis. Since she is
black, the most likely diagnosis is HbSS
disease. (Hem009)
10. PB in an asymptomatic patient who
had his spleen removed 10 years ago
following its rupture in a car accident
The arrow points to a spherocyte. In the
background are target cells (cells with a
bullseye center). Both types of RBCs are
commonly seen post-splenectomy. Unlike
spherocytes, which have too little
membrane ("skinny RBC"), hence forming
a sphere rather than a biconcave disc,
target cells have excessive membrane
("obese RBC"), hence forming a bulge in
the middle that collects more Hb. Howell
Jolly bodies and reticulocytes, and
siderocytes may also be present in the PB.
(Hem012)
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It is against copyright laws to make
electronic or printed copies of these slides!!
11. PB from a patient with sickle cell
disease
Note the nucleated RBC (NRBC), sickle
cells, and target cells, which are markers
of a hemoglobinopathy. NRBCs are
commonly seen when patients are briskly
hemolyzing and overtaxing the bone
marrow. (Hem016)
12. PB in an asymptomatic patient who
had a surgical scar in the LUQ
The arrow is pointing to a target cell
containing a remnant of nucleus called a
Howell Jolly body. The patient had a
ruptured spleen after a car accident and
had his spleen removed. Note the increase
in target cells. Target cells are increased
after splenectomy, in hemoglobinopathies,
and in alcoholics with liver disease.
(Hem017)
13. PB demonstrating rouleaux and
agglutination
Rouleaux (stack of coins) is associated
with an increase in IgG or fibrinogen,
while agglutination seen with an increase
in IgM, which owing to its pentameric
configuration is able to bridge the
negative charge around RBCs and
agglutinate them. Cold agglutinins contain
IgM antibodies, which clump RBCs in
digital vessels in cold weather and produce
Raynaud’s phenomenon. (Hem018)
14. Patients fingers: there is a history
of craving for eating ice chips and a
severe microcytic anemia
The nails exhibit spooning or koilonychia, a
characteristic feature of iron deficiency.
(Hem019)
15. Patient with a severe microcytic
anemia and dysphagia for solids (not
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liquids)
Note the cracking at the angles of the
mouth (cheilosis, stomatitis). With a
history of a microcytic anemia, and
dysphagia for solids, the patient probably
has the Plummer Vinson syndrome with
iron deficiency producing an esophageal
web, glossitis, cheilosis, and achlorhydria.
(Hem020)
16. PB from a 4 year old child with a
microcytic anemia and an increase in
the RDW. What is the most likely
diagnosis?
The cells are hypochromic. The most likely
cause is iron deficiency secondary to GI
blood loss, most often a bleeding Meckelâ
€™s diverticulum. (Hem021)
17. PB in a 22 year old woman with
menorrhagia and a microcytic anemia
with an increase in the RDW. What is
the most likely diagnosis?
The findings illustrate marked variation in
the size of the RBCs, hence the increase
in the RDW, and pronounced
hypochromasia, indicating a defect in Hb
synthesis. With a history of menorrhagia,
iron deficiency is most likely present. Iron
deficiency is the only microcytic anemia
with an increase in RDW. Serum ferritin
should be low in this patient. (Hem022)
18. PB in a patient with b-thalassemia
minor and a mild microcytic anemia
Note the tear drops cells, and cells with a
fine stippled appearance, the latter
representing persistence of ribosomes
(basophilic stippling). This is a nonspecific
finding in any anemia with a defect in Hb
synthesis, which characterizes the
microcytic anemias. Thalassemias
characteristically have an elevation in the
RBC count. (Hem023)
19. BM with a Prussian blue stain in an
alcoholic with a microcytic anemia
The patient has a sideroblastic anemia.
The ringed sideroblast in the slide
represents a nucleated RBC with iron
trapped in the damaged mitochondria
(alcohol is a mitochondrial poison).
Damage to the mitochondria interferes
with normal heme synthesis. Siderocytes
with iron (Pappenheimer bodies) often
accompany sideroblastic anemias. Alcohol
is the most common cause of acquired
sideroblastic anemia. Pyridoxine deficiency
and Pb poisoning are additional
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causes.(Hem024)
20. PB from the alcoholic with
microcytic anemia
Note the irregular dark inclusions in the
RBCs. These are clumps of hemosiderin in
the cytosol called Pappenheimer bodies
and the cells are called siderocytes
(sideroblasts are NRBCs in the bone
marrow). These are present in iron
overload diseases, in this case, alcohol
induced sideroblastic anemia. (Hem025)
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21. BM with Prussian blue stain in a
patient taking INH for an active case of
TB who has a microcytic anemia.
What is the most likely diagnosis?
Iron stores are increased and ringed
sideroblasts are present indicating a defect
in heme synthesis. INH produces
deficiency of pyridoxine (B6), which is a
cofactor in the reaction between glycine
and succinyl CoA to form D ALA. Iron
enters the mitochondria but cannot exit
the mitochondria, so it accumulates in
mitochondria located around the nucleus
and produces the ringed sideroblast (ring
around the collar). (Hem026)
22. X-ray of hand of 9 month old black
child with dactylitis and sickle cell
disease
Note the white out of the bones owing to
infarction and the densities in the
epiphyses of the digits, the latter
indicating lead poisoning. Pb is the only
heavy metal that deposits in the
epiphyses. (Hem027)
23. PB from the 9 month old child with
severe microcytic anemia and a history
of eating paint chips from his crib
The PB exhibits classic coarse basophilic
stippling owing to denaturation of
ribonuclease by Pb. Basophilic stippling is
due to persistence of ribosomes (Pb
denatures ribonuclease). Note also the
hypochromic microcytic cells owing to a
defect in heme synthesis (ferrochelatase
and ALA dehydrase are denatured by Pb).
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There is an increase in RBC
protoporphyrin and d ALA (Hem028)
24. PB finding in a 35 year old man
with epigastric distress, dark stools,
and a microcytic anemia. What is the
most likely diagnosis?
The smear shows marked microcytosis and
hypochromasia and the history suggests
GI blood loss, most likely from a bleeding
duodenal ulcer. (Hem029)
25. Teeth of a patient with a peripheral
neuropathy and normal anion gap
metabolic acidosis. What is the most
likely diagnosis
A lead line is noted along the gum margin.
In adults lead poisoning targets the
peripheral nervous system producing foot
drop (peroneal nerve palsy), wrist drop
(radial nerve palsy), claw hand (ulnar
nerve palsy) and the kidneys (proximal
renal tubular acidosis), owing to the toxic
effect of Pb (coagulation necrosis) on renal
tubular cells in the proximal tubule.
Patients lose amino acids, glucose,
phosphate, and uric acid in the urine.
(Hem030)
26. Physical diagnostic finding
You would expect what type of anemia in
the patient? Koilonychia is present which
suggests iron deficiency. (Hem031)
27. Physical diagnostic finding
Playing odds, what anemia would you
expect in this patient? Iron deficiency
anemia. Note the pale conjunctiva.
(Hem032)
28. Physical findings in a patient
compared to a normal hand
What is the difference? The patient’s
nail beds are pale and the palmar creases
are pale compared to normal indicating
anemia. (Hem033)
29. BM from a 65 year old woman with
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a macrocytic anemia, pancytopenia,
and absent vibratory sensation in the
lower extremities. What is the most
likely diagnosis?
The BM shows megaloblastic RBC and
WBC precursors consistent with B12/folate
deficiency, in this case, the former owing
to the neurological findings of posterior
column disease. These large cells are
destroyed outside the sinusoids in the
marrow by macrophages, hence producing
pancytopenia, a possibility for
unconjugated hyperbilirubinemia with
jaundice, and a marked increase in serum
LDH from the destroyed RBCs. (Hem035)
30. PB in a 35 year old alcoholic with a
macrocytic anemia. What is the most
likely diagnosis?
The slide exhibits a hypersegmented
neutrophil (pathognomonic of B12 or
folate deficiency) and a mature
lymphocyte. The RBCs are
macroovalocytes (egg shaped). The most
likely origin is folate deficiency owing to
only a 3-4 supply of folate in the liver.
Alcohol also blocks the reabsorbtion of
folate in the jejunum. Serum folate, RBC
folate, and B12 levels should be ordered.
(Hem036)
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31. PB in a 67 year old woman with a
macrocytic anemia
The arrow points to a tear drop cell, which
may be seen in patients with B12
deficiency, myelofibrosis, and thalassemia.
The other RBCs are macroovalocytes. The
patient has pernicious anemia. (Hem037)
32. PB from a patient with Crohn’s
disease and a macrocytic anemia
What is the most likely diagnosis?
The WBC is hypersegmented indicating
either B12 or folate deficiency. Since the
terminal ileum is involved in 80% of cases
of CD, the most likely diagnosis is B12
deficiency, since it is absorbed in the
terminal ileum. (Hem038)
33. PB in an alcoholic with alcoholic
hepatitis and a macrocytic anemia
What are these cells called? Note the
round, macrocytic target cell. Alcohol
increases the cholesterol in the RBC
membrane resulting in excess membrane
and target cell formation. Hypersegmented
neutrophils are not present in this type of
macrocytic anemia. (Hem039)
34. PB findings in a woman on birth
control pills who has a mild macrocytic
anemia
What is the most likely diagnosis? Note
the 2 hypersegmented neutrophils
indicating B12 and/or folate deficiency.
Birth control pills inhibit the uptake of the
monoglutamate form of folate in the
jejunum, hence producing a folate
deficiency. (Hem040)
35. BM from a patient with
pancytopenia and hepatitis C
The BM is aplastic. Interspersed among
the adipose cells are scattered
lymphocytes. Hepatitis C is the most
common infectious cause of aplastic
anemia, a stem cell disorder involving
suppression of the trilineage myeloid stem
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cell. (Hem041)
36. PB finding in a patient with celiac
disease, a normocytic anemia, and an
increased RDW
Note the two populations of RBCs
(dimorphic), both small and large cells,
the former representative of iron
deficiency and the latter folate/B12
deficiency secondary to malabsorption in
celiac disease. Since the MCV is a mean of
the average size of the RBCs, the MCV is
normal, however, the RDW, which detects
size variations is increased. Malabsorption
and the myelodysplastic syndrome are
common causes of dimorphic RBC
populations. (Hem042)
37. BM finding in a patient.
What would you expect the CBC to show?
The patient has an aplastic anemia, hence
one would expect pancytopenia.
(Hem043)
38. Schematic of the nonincubated and
incubated osmotic fragility test for
congenital spherocytosis and pyruvate
kinase (not discussed)
Note that in spherocytosis, the cells lyse
more easily than normal cells in hypotonic
salt solutions because they have less
membrane than normal RBCs and no extra
space to contain water and salt. Note that
incubation makes the defect more
pronounced. (Hem044)
39. PB from a 26 year old woman with
acute cholecystitis and a mild
normocytic anemia with an increased
corrected reticulocyte count
The patient has hereditary elliptocytosis,
an AD disease, with either a defect in
spectrin (similar to spherocytosis) or
protein 4.1 in the RBC membrane.
Increased extravascular hemolysis by
macrophages in the spleen increases the
release of unconjugated bilirubin, which
increases the amount of bilirubin
metabolized in the liver and excreted in
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the bile, hence predisposing to calcium
bilirubinate stones. (Hem045)
40. PB from a 27 year old with
splenomegaly and a mild normocytic
anemia with an elevated corrected
reticulocyte count
The patient has congenital spherocytosis,
an AD disease with a defect in spectrin in
the cell membrane causing the cell to lose
membrane ("skinny RBC") and form a
sphere rather than a biconcave disc.
Spherocytes are trapped and removed by
macrophages in the cords of Billroth
(extravascular hemolysis). Osmotic
fragility testing confirms the diagnosis.
(Hem046)
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Pathology I Images
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41. Gallstones removed from a 22 year
old female with a chronic hemolytic
anemia. What is the most likely
diagnosis?
The stones are calcium bilirubinate stones,
which indicate the presence of increased
generation of unconjugated bilirubin from
extravascular hemolysis in a chronic
hemolytic state such as congenital
spherocytosis or sickle cell disease. The
excess amount of conjugated bilirubin that
will be generated from metabolism of the
unconjugated bilirubin will combine with
calcium to form these small, jet black
stones. (Hem047)
42. PB from a patient with a brisk
hemolytic anemia. What is the most
likely diagnosis?
Note the presence of spherocytes and
polychromasia, the latter indicating a
pronounced erythropoiesis in the bone
marrow, which is common in hemolytic
anemias like congenital spherocytosis or
autoimmune hemolytic anemia.
(Hem049)
43. PB from a patient with jaundice
and a mild normocytic anemia with an
increased corrected reticulocyte count.
What is the most likely diagnosis?
The arrows point to spherocytes in a
patient with congenital spherocytosis (AD
disease). A lymphocyte is present in the
center of the slide. Jaundice is due to
extravascular hemolysis by macrophages
and increased production of unconjugated
bilirubin. (Hem050)
44. Hb electrophoresis patterns in
various hemoglobinopathies
Note the normal migration sites for a
normal person with HbA, HbA2, and HbF.
Patients with HbSA (trait) have ~40%
HbS, with the remainder representing A,
A2 and F. In HbSS (disease), there is no
HbA and varying amounts of HbF, the
latter a potent inhibitor of sickling (the
more the better). b-Thal major has a
proportionately greater concentration of
HbF than all the other types, while b-thal
minor has a slightly increased amount of F
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and A2. (Hem051)
45. PB and sickle cell prep. Note the
sickle cells and target cells in the PB and
how the sickle prep resulted in sickling of
most of the cells. Sodium metabisulfite is
used to reduce oxygen tension in the test
tube hence precipitating sickling. It is a
more sensitive and specific test than the
solubility test using dithionite. (Hem052)
46. PB finding in a patient with sickle
cell disease. The cell in question is a
nucleated RBC with a background of target
cells (bulls-eye appearance) and a mature
lymphocyte for comparison. Note that an
NRBC has a more pyknotic (ink dot)
appearance than a lymphocyte. In brisk
hemolytic episodes, NRBCs may be
released from the bone marrow.
(Hem053)
47. PB from a 9 month old black child
with painfully swollen hands and feet
The patient has sickle cell disease and is
presenting with dactylitis (infarctions in
the bones of the digits). Note the sickle
cells and the target cells in the
background. HbS is the substitution of
valine for glutamic acid in the sixth
position of the b-chain. (Hem054)
48. Hands from the 9 month old black
child with sickle cell disease and
dactylitis, the first manifestation of
sickle cell disease
HgF protects the child from this
complication for the first few months by
inhibiting sickling. (Hem055)
49. Two year old child with sickle cell
disease: What does the RBC finding
signify in this patient?
Note the single RBC with a Howell Jolly
body (nuclear remnant). This indicates
that the patient's spleen is non-functional.
(Hem223)
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50. PB in a 22 year old black man with
chest pain. What is the most likely
diagnosis?
The patient has sickle cell disease (note
sickle cells and the background of target
cells) and the acute chest syndrome. The
latter is associated with fever, hypoxemia,
a pulmonary infiltrate, and pleuritic chest
pain. It is treated with oxygen and blood
transfusion. (Hem058)
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51. Schematic of the pentose
phosphate shunt and G6PD deficiency
Note that the absence of G6PD (SXR
disease) reduces the production of NADPH
(this shunt is most responsible for this
substrate) and glutathione (GSH) which
neutralizes peroxide and other free
radicals (acetaminophen FR). Peroxide is a
by-product of every living cell, hence the
need for GSH and catalase in peroxisomes
for neutralizing peroxide. In the RBC,
peroxide may increase in the presence of
oxidizing agents (primaquine, dapsone) or
infection, the latter representing the most
common precipitating cause of RBC
hemolysis in the enzyme deficiency. Left
unneutralized, peroxide denatures Hb
(forms Heinz bodies) and damages SHgroups
in the RBC membrane resulting in
an intravascular hemolytic anemia. It
should not be surprising that infection is
the most common precipitating event,
because the oxygen dependent MPO
system requires NADPH as a cofactor with
NADPH oxidase to generate superoxide for
the most potent of the bactericidal
systems in neutrophils and monocytes.
(Hem059)
52. PB on the left and special
supravital stain on the right in a black
man who developed a hemolytic
anemia when he took primaquine for
malaria.
The patient has G6PD deficiency, or Heinz
body anemia. The absence of the enzyme
reduces the amount of glutathione
synthesized which is necessary to
neutralize peroxide in the RBC when
infections occur or oxidizing drugs are
used. Peroxide damages the Hb producing
Heinz bodies and damages the sulfhydryl
groups in the RBC membrane, producing a
predominantly intravascular hemolysis.
The Heinz body prep is best to diagnose
the disease in the active stage of
hemolysis, while the enzyme assay
confirms the diagnosis when hemolysis has
subsided and new RBCs are synthesized
that are either deficient in the enzyme or
contain a defective enzyme that degrades
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as the RBC matures. (Hem60)
53. BM finding in a patient with a
hemolytic anemia and positive direct
Coombs test
The arrow points to a macrophage that
has phagocytosed a number of RBCs
(erythrophagocytosis) that are coated by
IgG and C3 for which the macrophages
have receptors. In the direct Coombs test,
rabbit anti-human IgG and C3 antibodies
crosslink RBCs coated by IgG and C3
causing them to visibly clump under the
microscope. Extravascular hemolysis is the
most common mechanism of RBC
destruction in autoimmune hemolytic
anemias. The end-product of the RBC
destruction is unconjugated bilirubin. The
iron and amino acids are recycled.
(Hem061)
54. PB in a patient with SLE and a
normocytic anemia with an elevated
corrected reticulocyte count
What is the most likely diagnosis? Note
the spherocytes and shift cells (marrow
reticulocytes) in the smear and the
segmented neutrophil. The patient has an
autoimmune hemolytic anemia with a brisk
erythropoiesis in the BM causing the
release of shift cells. Spherocytes are
noted in autoimmune hemolytic anemias,
since macrophages in the spleen may only
take part of the RBC membrane in an
attempt at phagocytosis, hence causing
the cell to lose its biconcave configuration.
A direct Coombs test was positive in this
patient. (Hem062)
55. PB in a patient with severe calcific
aortic stenosis and a mild normocytic
anemia with an increased corrected
reticulocyte count. What is the most
likely diagnosis?
Note the increased number of schistocytes
that have traumatized by the calcified
valve. This is a microangiopathic anemia.
Haptoglobin levels would be low and
hemosiderin present in the urine
sediment. Iron deficiency and
thrombocytosis commonly occur in chronic
cases. (Hem064)
56. Peripheral blood from a missionary
with spiking fever: What is the most
likely diagnosis?
The patient has falciparum malaria. Note
the ring forms in many of the RBCs. Some
are multiply infected, which is a
characteristic of falciparum malaria. Only
ring forms and gametocytes are present in
the peripheral blood in this type of
malaria. Fever corresponds with rupture of
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the RBCs (intravascular hemolysis).
(Hem232)
57. Peripheral smear from a 3 year old
boy with recurrent infections
Arrow points to neutrophil with giant
lysosomes of Chediak Higashi syndrome.
AR disease with a membrane defect in
transferring lysosomal enzymes into
phagocytic vacuoles. Since the lysosomes
have never been emptied, they are
markedly enlarged. Patients also have
severe neutropenia. (Hem065)
58. PB finding in a 5 year old child
with Streptococcus pneumoniae
pneumonia and a WBC count of 55,000
cells/m L. The WBCs are predominantly
segmented neutrophils and a few band
neutrophils. Since the count is >50,000
cells/m L, this would qualify as a
leukemoid reaction secondary to the
underlying bacterial pneumonia. A
leukocyte alkaline phosphatase score (LAP
is a marker of mature neutrophils) would
be elevated. (Hem066)
59. PB finding in a child with cystic
fibrosis who has fever, productive
cough and a left shifted smear
The cell is a neutrophil demonstrating
toxic granulation (increased number of
nonspecific, azurophilic granules containing
myeloperoxidase), phagolysosomes
(arrows pointing to vacuoles in the
cytoplasm) indicating that phagocytosis
has occurred. The patient most likely has a
bacterial pneumonia, which is responsible
for this type of neutrophil response.
(Hem067)
60. Peripheral smear from a 15 year
old boy with fever, RLQ pain, and
rebound tenderness
Segmented neutrophil, band, and
metamyelocyte are present. There is toxic
granulation and increased vacuoles
(phagolysosomes). This is a left shifted
smear and the history suggests acute
appendicitis. (Hem068)
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Hematology7
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Pathology I Images
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Hematology
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61. Peripheral smear normal patient
Cell #1 is a mature lymphocyte and cell
#2 an eosinophil. Note how the red
granules do not cover the nucleus and
match the color of the RBCs. (Hem069)
62. PB finding in a child with fever and
severe cough characterized by
paroxysms of coughing followed by an
inspiratory whoop
The WBC count is 60,000 cells/m L. All of
the cells, except for the eosinophil, are
mature lymphocytes, hence the smear is
characterized as an absolute
lymphocytosis. Since the count is >50,000
cells/m L, it qualifies as a leukemoid
reaction, which is commonly encountered
in whooping cough (Bordetella pertussis).
Note that the lymphocytes are mature and
have no atypical features. (Hem070)
63. Asymptomatic 25 year old man
Note the hyperchromatic nuclear
chromatin and the bilobed nucleus. This
patient has Pelger-Hu�t syndrome, an
AD disease with no clinical significance.
The cells function normally. Pseudo-Pelger-
Huet cells are noted in myeloproliferative
diseases (e.g., chronic myelogenous
leukemia). (Hem071)
64. Peripheral smear from a 65 year
old man with colon cancer metastatic
to the liver
The cell in the slide accounted for 15% of
the WBC count. The cell in question is a
monocyte with linear appearing chromatin
and a slate gray cytoplasm with vacuoles.
Monocytosis is commonly present in
malignancy and chronic inflammation.
(Hem072)
65. PB finding in a 3 month old infant
with fever and wheezing
The cell is a mature lymphocyte in a
patient with a bronchiolitis secondary to
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the respiratory syncytial virus.
Lymphocytosis is common in viral
infections. (Hem073)
66. Peripheral smear from a 20 year
old college student with malaise,
exudative tonsillitis, cervical
lymphadenitis, and
hepatosplenomegaly
Note the large lymphocyte with activated
nuclear features and abundant blue
cytoplasm. These are atypical lymphocytes
(antigenically stimulated lymphocytes) in a
patient with EBV induced infectious
mononucleosis. The lymphocytes are
activated T cells responding to EBV
infecting B cells after attaching to CD21
receptors on their surface. (Hem074)
67. Mouth of a 25 year old woman with
generalized fatigue,
hepatosplenomegaly, cervical lymphadenopathy
and atypical
lymphocytosis
Palatal petechiae are commonly seen in
patients with infectious mononucleosis.
However, they are not pathognomonic of
the disease. (Hem075)
68. PB from a 60 year old man with
splenomegaly
The cell depicted in the slide accounted for
8% of the WBC differential count. The cell
in question is a basophil with dark purple
granules covering the nucleus. Basophilia
is a hallmark for myeloproliferative
diseases such as PRV, CML, agnogenic
myeloid metaplasia, and essential
thrombocythemia. With the presence of
splenomegaly, a myeloproliferative disease
is likely in this patient. (Hem076)
69. 55 year old man with flushing of
the face, headaches, splenomegaly,
and a Hb of 19 gm/dL
The patient has a plethoric face and
polycythemia with splenomegaly, hence
polycythemia rubra vera is the most likely
diagnosis. Plethora is due to the release of
histamine from the increased numbers of
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mast cells/basophils. (Hem077)
70. 45 year old man with anemia,
110,000 WBC count,
thrombocytopenia,
hepatosplenomegaly
Note the mixture of mature and immature
WBCs. Cells with round nuclei are
myeloblasts, progranulocytes, or
myelocytes. Metamyelocytes (slight
indentation of nucleus), band neutrophils,
and segmented neutrophils also present.
Leukocyte alkaline phosphatase score was
zero and the Philadelphia chromosome
positive indicating chronic myelogenous
leukemia. (Hem078)
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Hematology8
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Pathology I Images
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Hematology
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71. PB finding in a 60 year old woman
with massive splenomegaly and a dry
tap on attempted bone marrow
aspiration
The RBC is a tear drop cell, which is a
characteristic finding of agnogenic myeloid
metaplasia, a myeloproliferative disease.
The disease begins in the bone marrow
and shifts to the spleen where
extramedullary hematopoiesis takes over
the bone marrow functions.
Megakaryocytes in the bone marrow
stimulate fibrogenesis, which traps
erythroid islands and damages RBCs as
they try to enter the sinusoids. Tear drop
cells are also noted in the thalassemias
and megaloblastic anemias due to folate
and B12 deficiency. (Hem079)
72. Bone marrow biopsy from a 60
year old patient who has massive
splenomegaly and a dry bone marrow
aspirate
Note that the marrow is replaced by
fibrous tissue. The large cells represent
benign megakaryocytes, which secreted
platelet derived growth factor, an agent
that stimulates reactive fibrosis in the
marrow. Reactive marrow fibrosis may
also occur with metastatic disease and
radiation. (Hem080)
73. PB findings in a 65 year old woman
with GI bleeding, hepatosplenomegaly,
mild neutrophilic
leukocytosis, and a platelet count over
1,000,000 cells/m L
The patient has essential
thrombocythemia, a myeloproliferative
disease with excessive production of
platelets (>600,000 cells/m L). Bleeding is
more characteristic than thrombosis, since
the platelets are defective and do not
aggregate. A bone marrow would reveal
large, dysplastic appearing
megakaryocytes. This is the least common
of the myeloproliferative diseases.
(Hem082)
74. BM findings with Prussian blue
stain from a 79 year old man with a
refractory macrocytic anemia,
pancytopenia, and dimorphic RBC cell
Hematology8
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populations (small and large)
The patient has myelodysplastic syndrome
(MDS) with megaloblastoid RBCs and
ringed sideroblasts (defect in heme
synthesis). These patients frequently have
chromosome defects and commonly
progress into acute leukemia. (Hem083)
75. PB finding in a 3 year old child
with fever, bone pain, anemia,
thrombocytopenia, elevated WBC
count, hepatosplenomegaly, and
generalized lymphadenopathy
The cells are all lymphoblasts, many of
which contain nucleoli. The patient has
acute lymphoblastic leukemia (ALL), which
is not only the most common cancer in
children, but also the most common
leukemia up to 15 years of age. The
majority are common ALL antigen positive
CD10 B cell leukemias. The type of ALL is
the most important prognostic factor.
(Hem084)
76. Peripheral smear from a 70 year
old man with generalized non-tender
lymphadenopathy, hepatosplenomegaly,
normocytic anemia,
thrombocytopenia, and a WBC count of
35,000 cells/m L
All of the cells are lymphocytes with
hyperchromatic nuclei. Note the smudge
cells as well (fragile lymphocytes crushed
in the smear preparation). The patient has
chronic lymphocytic leukemia, the most
common overall leukemia, and the most
common one in patients over 60 years old.
The majority are B cell malignancies.
(Hem085)
77. PB from a 65 year old man with
hepatosplenomegaly, normocytic
anemia, thrombocytopenia, and these
abnormal cells in the smear
The patient has hairy cell leukemia. Note
the hairy cytoplasmic projections. The
tartrate resistant acid phosphatase stain is
positive in these neoplastic B cells. The
spleen is the reservoir for the neoplastic
cells, hence splenectomy is usually
performed as part of the treatment.
Lymphadenopathy is characteristically
absent, an unusual feature for leukemia.
Splenomegaly is invariably present. Unlike
most leukemias which infiltrate both the
red and white pulp, HCL only infiltrates
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the red pulp. (Hem086)
78. Peripheral blood in a 25 year old
man with normocytic anemia,
thrombocytopenia, WBC count of
20,000 cells/m L, hepatosplenomegaly
and generalized lymphadenopathy
The cell with the arrow is a myeloblast
with an Auer rod (red splinter) in the
cytoplasm. Acute myelogenous leukemia is
the most common leukemia from 15-39
years of age. (Hem247)
79. PB from a 32 year old male with
anemia, thrombocytopenia, and an
elevated WBC count containing cells
similar to those noted in the slide
The patient has acute myelogenous
leukemia. Note the myeloblast with the
Auer rods. (Hem088)
80. 22 year old man with acute
leukemia
The patient has gum infiltration by
leukemic cells. This is characteristic of
acute monocytic leukemias. (Hem089)
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Pathology I Images
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Hematology
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81. Peripheral blood from a 25 year old
man with disseminated intravascular
coagulation: What is the treatment for
this type of leukemia?
The patient has acute progranulocytic
leukemia (M3), which almost invariably
presents with DIC. These patients have a
t(15;17) translocation and can be treated
with retinoic acid (vitamin A). Retinoic acid
increases maturation of the blasts.
(Hem250)
82. 12 year old boy with epistaxis
Patient with petechial lesions on skin.
These do not blanch with pressure.
Platelet count was 5000 cells/m L
consistent with idiopathic
thrombocytopenic purpura, an
autoimmune disorder with IgG antibodies
against a platelet antigen (type II
hypersensitivity). (Hem090)
83. Bone marrow aspirate from a
woman with SLE who has
thrombocytopenia
The marrow exhibits clumps of
megakaryocytes that are not budding off
platelets from their cytoplasm. This is a
characteristic feature of autoimmune
thrombocytopenia and would also have
been present in the previous patient as
well. (Hem091)
84. Finger of a 23 year old man with
severe iron deficiency and a positive
stool guaiac
The patient has Osler-Weber-Rendu
disease (hereditary telangiectasia). Note
small vascular lesions on the pad of the
finger. These are also located in the
mouth and GI tract, hence predisposing to
blood loss and iron deficiency. (Hem092)
85. Hands of a 70 year old woman with
a normal platelet count and CBC. The
patient has senile purpura with rupture of
small vessels producing these ecchymotic
areas in the subcutaneous tissue. Vascular
instability is common in the elderly. These
could also have occurred as a response to
being over-anticoagulated with warfarin or
Hematology9
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heparin. (Hem093)
86. Patient with hyperextensible joints
and skin: What is the defect in this
patient?
The patient has Ehlers-Danlos syndrome,
which is a group of diseases with various
defects in collagen. Note the ecchymoses
related to vessel instability. (Hem273)
87. 15 yr old boy with palpable
purpura, hematuria, and polyarthritis.
What is the mechanism of the patient's
vascular problem?
The patient has Henoch-Schönlein
purpura, the MC vasculitis in children. It is
a small vessel vasculitis due to IgA-anti-
IgA immunocomplexes (type III
hypersensitivity). (Hem277)
88. Tooth socket in a 22 year old with
a recent extraction and problems with
persistent bleeding
The bleeding time is normal and the aPTT
prolonged. Persistent bleeding from a
tooth extraction is characteristic of a
coagulation disorder, in this case,
hemophilia A. A temporary platelet plug is
formed in the socket, however, a stable
clot is not formed, hence late rebleeding is
commonly observed. The single best
question to ask a patient that will exclude
any significant hemostasis abnormality is
how well they did after a molar extraction.
(Hem094)
89. 18 year old boy with a prolonged
aPTT. The patient has an intramuscular
hematoma secondary to severe hemophilia
A. Bleeding into closed spaces or fascial
planes is a feature of a coagulation
deficiency. (Hem095)
90. Cervical lymph node biopsy from a
25 year old man with painful cervical
lymphadenopathy
Hematology9
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The node shows the classic features of
reactive hyperplasia: sharply demarcated
follicles (B cells) with a mantle of darkly
staining B cells, and paracortex (T cells).
Note the variety of cellular types in the
node which distinguishes it from a
malignant lymphoma. The follicles have
been antigenically stimulated, hence the
node becomes enlarged and painful. The
cells in the center of the follicles are
antigenically stimulated B cells in different
stages of development: small cleaved
large cleaved small non-cleaved large
non-cleaved immunoblast plasma cell.
(Hem096)
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Hematology10
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Pathology I Images
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Hematology
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91. Child with ataxia telangiectasia:
This is an AR chromosome instability
syndrome (increased susceptibility to
chromosomal mutations involving defects
in DNA repair enzymes) that predisposes
to malignant lymphomas and leukemias.
Note the vessel telangiectasias in the eye.
Cerebellar ataxia, recurrent sinus
infections, and B and T cell defects are
present. (Hem253)
92. Child with Wiskott-Aldrich
syndrome:
This is an SXR disease with a triad of
eczema (evident in this child),
thrombocytopenia, and recurrent
sinopulmonary infections. They have both
B and T cell defects and an increased
incidence of leukemia and lymphomas. Rx:
bone marrow transplant. (Hem254)
93. Lymph node biopsy from a 55 year
old woman with non-tender cervical
lymphadenopathy
The biopsy shows a monomorphic infiltrate
of cells forming nodular areas. The normal
sharply demarcated follicles (B cells) and
the paracortex (T cells) have been
replaced by these neoplastic cells. This is
follicular B cell lymphoma, the most
common non-Hodgkin’s lymphoma in
adults. It commonly involves the bone
marrow and peripheral blood, but is
considered a low grade malignancy.
(Hem097)
94. Cross-section of trachea and arch
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vessels in a patient with a malignant
lymphoma:
Note the bulging, fish flesh appearance of
the tumor. Note that the tumor cells
cannot invade elastic tissue or cartilage.
(Hem256)
95. African child with a jaw tumor:
What is the etiologic agent?
The patient has the African variant of
Burkitt's lymphoma, which has a high
association with EBV. Patients also have a
t(8;14) translocation of the c-myc
oncogene, which is a nuclear transcriber.
(Hem259)
96. Lymph node biopsy of a paraaortic
node from a 5 year old child
The patient has Burkitt’s lymphoma, the
most common lymphoma in children.
Unlike the African variant, the American
variant is more commonly located in the
abdominal cavity. Note the characteristic
"starry sky" appearance, where the dark
of night are the small noncleaved
malignant B cells and the stars are
tingible macrophages with apoptotic
remnants of phagocytosed B cells. It is a
high grade lymphoma. There is an
association with EBV and a t(8;14)
translocation. (Hem098)
97. Patient with an abnormal infiltrate
of cells in the skin. The patient has the
nodular, ulcerated plaques of mycosis
fungoides, a malignancy of CD4 T
helper cells
Skin infiltration by the malignant T cells
results in these lesions. Collections of
malignant cells in skin are called Pautrier’s
microabscesses. When the cells enter the
blood stream, they are called Sezary cells
and the disease changes its name to
Sezary syndrome. (Hem099)
Hematology10
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98. Abnormal cells in the blood of the
above patient
The cells with the nuclear cleft are
malignant CD4 T helper cells, or Sezary
cells. They stain positive for PAS (not
demonstrated in this slide) and have PAS
positive chunks of material located around
the nucleus ("ring around the collar"
analogous to ringed sideroblasts in
sideroblastic anemias"). (Hem100)
99. Lymph node in cross-section from
a 32 year old female with nonpainful
cervical lymphadenopathy and an
anterior mediastinal mass
The lymph node shows the characteristic
features of nodular sclerosing Hodgkin’s
lymphoma, the most common HL and the
one most commonly seen in women. The
fibrotic areas separate the lymphoid tissue
into nodular appearing areas. These areas
contain spaces (not easily visible on this
slide) within which are lacunar cells, a
variant of Reed-Sternberg cells.
(Hem101)
100. Cell found in the right
supraclavicular lymph node of a 19
year old man
The cell is a Reed-Sternberg (RS) cell. The
RS cell is a single large cell with two or
more nuclei or nuclear lobes with a large
inclusion body-like eosinophilic nucleolus
surrounded by a halo of clear nucleoplasm
(has an "owl eye" appearance).
Mononuclear variants (single, round
nucleus) of the RS cell are noted in the
different subtypes. The L and H variant
Hematology10
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("popcorn cell") is noted in the lymphocyte
predominant HL, which frequently has a
lymphocytic and histiocytic infiltrate,
hence the term L and H cell. The lacunar
cell variant is noted in nodular sclerosing
HL and consists of a multilobulated
nucleus surrounded by a clear space,
which may represent artifactual distortion
related to formalin fixation of the node.
Mononuclear variants are noted in
mixed cellularity HL which resemble RS
cells but for the presence of a single
nucleus with a prominent nucleolus. Unlike
NHL, the lymphocytes in the lymph nodes
involved with HL are not neoplastic, which
has a binucleate cell with prominent red
nucleoli surrounded by a clear space. RS
cells are the neoplastic cell in HL. They
are of B cell origin in some variants or T
cell origin in other variants. It is essential
for securing the initial diagnosis of HL in
lymph nodes but is not pathognomonic of
HL, since there are many look-alikes, e.g.,
immunoblasts in infectious mononucleosis.
(Hem102)
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Hematology11
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Pathology I Images
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Hematology
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101. Lymph node (higher
magnification) from a patient with
nodular sclerosing HL
Note the spaces within which are
multinucleated cells with small nucleoli
(lacunar cells). This is characteristic of
nodular sclerosing HL. (Hem103)
102. Lymph node biopsy in a 17 year
old with painless cervical
lymphadenopathy
A classic RS cell is present. The patient
most likely has a lymphocyte predominant
HL, where RS cells are very difficult to
find, hence the better prognosis, since
they are the neoplastic cell of HL.
(Hem104)
103. EM finding of interstitial tissue
from a rectal biopsy in a patient with
macroglossia, hepatosplenomegaly,
and massive proteinuria
The EM shows the non-branching fibril
with a hollow core of amyloid. The patient
has secondary (reactive) amyloidosis, the
amyloid, in this case, derived from serum
associated amyloid (SAA) protein
synthesized in the liver. Amyloid is Congo
red positive, which fluoresces apple green
(Granny Smith apple) under the polarizing
microscope. (Hem105)
104. Patient with macroglossia,
restrictive cardiomyopathy, and the
nephrotic syndrome. What systemic
disease is most likely present?
The patient has macroglossia secondary to
secondary (reactive) amyloidosis. Chronic
diseases are most often associated with
this type of amyloidosis, which is due to
conversion of serum associated amyloid
into amyloid. (Hem270)
Hematology11
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105. BM finding in a 70 year black
woman with bone pain, anemia,
rouleaux, and a pathologic fracture of
the rib
The patient has multiple myeloma. Note
the sheets of malignant plasma cells with
eccentric nuclei, perinuclear clearing, and
bright blue cytoplasm (increased RER with
immunoglobulin synthesis). Light chains in
the urine are called Bence Jones protein.
The cells produce osteoclast activating
factor (IL-1), which is responsible for the
lytic areas in bone and hypercalcemia.
Rouleaux occurs when immunoglobulins
are increased. (Hem106)
106. Skull x-ray from the black woman
in the above case
Note the lytic areas in the skull associated
with the release of osteoclast activating
factor from malignant plasma cells in
multiple myeloma. (Hem107)
107. Serum immunoelectrophoresis in
a patient with multiple myeloma.
Which immunoglobulin and light chain
are abnormal in this patient?
N refers to the normal control and P refers
to the patient. There is an abnormal arc
for IgG and k light chain. Light chains in
the urine are called Bence Jones protein,
which is toxic to the renal tubules and
leads to renal failure. (Hem269)
Hematology11
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108. Bone marrow finding in an adult
with massive splenomegaly and
increased total acid phosphatase levels
The cell is a macrophage containing a
fibrillary material. This is a cell in
Gaucher’s disease, which is an AR
lysosomal storage disease with a
deficiency of glucocerebrosidase and an
accumulation of glucocerebroside. Infantile
and adult types of the disease are
recognized. The cells contain large
amounts of acid phosphatase. (Hem108)
109. Bone marrow finding from an
infant with severe mental retardation
and hepatosplenomegaly
The foamy appearing cell with a small
nucleus is a macrophage containing
lysosomes filled with sphingolipid. The
patient has Niemann Pick disease, an AR
disease with an absence of lysosomal
sphingomyelinase. (Hem109)
110. EM of a cell which was part of an
infiltrate in the skin of a 3 year old
child with an eczematous rash,
hepatosplenomegaly, and generalized
lymphadenopathy
The cells were CD1 positive. The finding in
the cell is a Birbeck granule (looks like a
tennis racket), which is a characteristic
finding in Langerhan’s cells, a true
histiocyte. The patient has Letterer Siwe
disease, which is part of the histiocytosis
X complex of diseases. (Hem110)
111. Lymph node biopsy from the
above patient. What are the pink
staining cells called and where are
they normally located?
The pink staining aggregates are
malignant histiocytes, which are normally
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present in the sinuses of a lymph node.
(Hem265)
112. Child with Rh hemolytic disease
of the newborn: Why is the fetus
edematous?
The child has hydrops fetalis. Patients with
Rh hemolytic disease have severe
anemias, which lead to high output failure
and both left and right heart failure, the
latter responsible for peripheral edema
and ascites. The liver in this fetus had
massive hepatomegaly secondary to
extramedullary hematopoiesis. (Hem282)
113. Brain of the above fetus. What is
causing the yellowish discoloration?
The yellow pigment is unconjugated, lipid
soluble bilirubin derived from macrophage
destruction of the Rh-sensitized fetal
RBCs. The condition is called kernicterus.
(Hem284)
114. Kleihauer-Betke test in maternal
blood post-delivery. The mother is O
negative and the baby is O positive.
Who do the normal colored RBCs
belong to and what should the mother
be given to prevent sensitization?
The normal staining cells contain Hgb F
and represent fetal RBCs, while the pale
staining cells contain Hgb A from the
mother. She should be give Rh immune
globulin (anti-D) to prevent sensitization
to the D antigen. (Hem285)
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Pathology I Images
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Cardiovascular
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It is against copyright laws to make
electronic or printed copies of these slides!!
1. Test tube: turbid specimen
When a tube of turbid plasma is
left overnight in a refrigerator at
4OC, chylomicrons float on top of
the plasma (form a supranate),
since they have very little protein,
while VLDL produces an infranate,
since it contains more protein and
is more dense than chylomicrons.
This tube has both a supranate
and an infranate (pinkish staining)
indicating the presence of both
chylomicrons and VLDL. This is
type V hyperlipoproteinemia, which
is commonly seen in diabetic
ketoacidosis. (CV001)
2. Test tubes
The tube on your left is clear,
however the LDL fraction is
markedly increased. LDL contains
CH, which does not produce
turbidity. The patient has a type II
hyperlipoproteinemia. The tube on
the right has a supranate (arrow)
and clear infranate indicating the
presence of chylomicrons. The
most common cause of this is
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someone who did not fast and had
a breakfast full of saturated fats. If
this was a hyperlipoproteinemia, it
would be a type I
hyperlipoproteinemia. (CV002)
3. Patient: Achilles tendon
xanthoma
This type of lipid deposit is
pathognomonic for familial
hypercholesterolemia, which is an
AD disease with absence of LDL
receptors. (CV003)
4. Patient with xanthelasmas
Note the yellow, plaque-like lesions
on the upper and lower eyelids in
both eyes. These lesions are
associated with
hypercholesterolemia - e.g. familial
hypercholesterolemia, obstructive
jaundice, or hypothyroidism.
(CV204)
5. Vessel: hyaline
arteriolosclerosis
Arteriosclerosis (hardening of the
arteries) involves both small and
large vessels. Hyaline
arteriolosclerosis is a small vessel
arteriosclerosis that is commonly
found in diabetics and
hypertensives. (CV004)
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6. Vessel: hyperplastic
arteriolosclerosis: This is the
other type of small vessel
arteriosclerosis. It is predominantly
seen in malignant hypertension
and renal disease associated with
polyarteritis nodosa and
progressive systemic sclerosis. It is
also characteristic of the arterioles
in the spleen in patients with SLE.
Note the "onion skin" appearance
of the vessels. This is secondary to
hyperplasia of the smooth muscle
in the wall of the vessels.
(CV005)
7. Aorta: complicated
atheromatous plaques
Note the raised yellow plaques and
the fissures in between the
plaques. Dystrophic calcification is
likely present as well. (CV205)
8. Aorta: aorta with complicated
atheromatous plaques
Note the fissured-appearing
endothelial surface and raised
plaque-like structures from the
surface. Red clot material is
adherent to the plaques in multiple
areas. These clots consist of
platelets held together by fibrin
strands. Aspirin would have
prevented these clots from
forming. The blotchy white areas
represent dystrophic calcification.
This is an example of advanced
atherosclerosis. It is likely that this
patient had an increase in LDL.
(CV006)
9. Patient: dry gangrene of the
foot in a diabetic
Note the blackened big toe and
little toe. Ulcers are present on the
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undersurface of the big toe and
the metatarsophalangeal joint.
These are called pressure ulcers
and are primarily due to peripheral
neuropathy and inability to feel
any pain in areas of trauma.
Ischemia and infection also play a
role in their development.
Coagulation necrosis is primarily
operative in this patient. However,
anaerobic infection commonly
occurs leading to gas production,
further ulceration of the foot, a
malodorous exudate, and gas in
the subcutaneous tissue. In this
case, liquefactive necrosis would
be the predominant type of
infection, hence the term wet
gangrene. (CV007)
10. Aorta: atherosclerotic
abdominal aortic aneurysm
Note the fusiform dilatation of the
aorta below the renal arteries. The
lumen is filled with atheromatous
debris. Abdominal aortic
aneurysms are the most common
overall aneurysm. Weakening of
the wall by atherosclerosis occurs
owing to no vasa vasorum below
the renal artery orifices. (CV008)
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Pathology I Images
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11. Ascending aorta: dissecting aortic aneurysm
The tear in the aorta is at the top of the screen. A
toothpick extends through the opening. Blood dissected
proximally and emptied into the pericardial sac. The small
toothpick is where the pericardial reflection is located.
(CV208)
12. Aortic arch vessels: dissecting aortic aneurysm
This is a cross-section of two of the elastic arteries
coming off the arch of the aorta. Note how the lumens of
both vessels are compressed by clotted blood within the
wall of the vessels. This is a type A proximal dissection,
where blood entered an intimal tear and extended
proximally and up into the arch vessels. (CV009)
13. Aorta: dissecting aortic aneurysm
Note the two lumens in the aorta (double barreled aorta).
The lumen on the top is a false lumen (clot has been
removed) created by a more proximally located dissection.
The false lumen represents the outer media and adventitia
of the aorta. The lumen below the false lumen is the true
lumen. This is a type B dissection. (CV010)
14. Patient with Marfan's syndrome
Marfan's syndrome is an AD disorder with a defect in the
synthesis of fibrillin, hence elastic tissue is weakened.
Note the longitudinal scar on the patient's chest, most
likely representing repair of a previous dissection. The arm
span is greater than the height of the patient and the
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distance from the pelvic brim to the heels is greater than
the distance from the brim to the top of the head. This
describes eunuchoid proportions. (CV210)
15. Patient with Marfan's syndrome: dislocated lens
and high arched palate
Since the suspensory ligament holding the lens in place is
composed of elastic tissue and the elastic tissue is
weakened in Marfan's syndrome, the lens commonly
dislocates. Note the high arched palate, which is also a
characteristic feature. Arachnodactyly (not shown) is yet
another physical finding. (CV211)
16. Arch of aorta: syphilitic aneurysm
Note the large depression just below the ruler which
represents the aneurysm. The aortic valve ring is
stretched, which leads to the murmur of aortic
regurgitation. The pathogenesis relates to a vasculitis of
the vasa vasorum (endarteritis obliterans), which
decreases blood flow to the tissue within the aorta. The
weakened tissue begins to outpouch in response to the
increased stroke volume. (CV207)
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17. Patient: varicose veins in the lower extremeties
Note the bulging and tortuous veins particularly in the left
lower leg. There is some discoloration along the medial
portion of the ankle, suggesting that the varicosities may
be due to deep venous thrombosis and a backup of blood
into the superficial saphenous system. (CV212)
18. Superficial saphenous veins: primary varicosities
involving the superficial saphenous veins
Note the marked tortuosity and dilatation of the vessels.
Usually there is absence of the sentinel valve in the
femoral vein. (CV014)
19. Patient: superior vena caval syndrome:
This patient has a small cell cancer of the lung that has
blocked off the superior vena cava. Note the congestion of
the head and neck due to the backup of venous blood.
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(CV015)
20. Patient: lymphedema of the arm post-modified
radical mastectomy and radiation
Note the marked enlargement of the extremity.
Lymphedema is non-pitting. (CV016)
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Pathology I Images
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Cardiovascular
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21. X-ray study: Takayasu's arteritis
The arrows point to numerous areas of constriction in the
subclavian arteries. The patient most likely had weak to
absent pulses in both upper extremities. (CV219)
22. Arteriole: fibrinoid necrosis (leukocytoclastic
vasculitis):
Note the pink staining material (fibrinoid necrosis) in
multifocal areas of the thickened wall of the venule. The
material represents protein derived from the plasma that
has deposited in the vessel wall owing to an increase in
vessel permeability from the inflammatory process. It is
called fibrinoid because it looks like fibrin in a clot but it is
really protein. Small vessel vasculitis is usually due to
immune complex (IC) disease (type III hypersensitivity).
ICs are deposited in the vessel wall and then activate the
complement system. C5a, a chemotactic factor, attracts
neutrophils (only a few are visible at around 7 o clock).
Neutrophils are responsible for the vessel injury. (CV017)
23. Patient's lower legs: palpable purpura
Note the red-blotchy areas scattered randomly over the
skin surface. These lesions would be palpable, hence the
term palpable purpura. Palpable purpura is due to a small
vessel vasculitis with destruction of the vessel leading to
an extravasation of blood into the subcutaneous tissue.
The inflammation around the vessel (tumor of
inflammation) makes the lesion palpable. This patient had
Henoch-Schoenlein s purpura. (CV018)
24. Patient: temporal arteritis
Note the prominent temporal artery. A biopsy of the
artery reveals multinucleated giant cells (granulomatous
vasculitis, see arrow). (CV019)
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25. Patient: thromboangiitis obliterans (Buerger s
disease)
Note the blackened digits (coagulation necrosis).
Autoamputation of the digits is likely to occur in this
patient. (CV020)
26. Child: swelling of the hand in Kawasaki's disease
The patient had all the findings of this disease including
chest pain (coronary artery vasculitis), erythema of
mucous membranes and swelling of the dorsum of the
hands. Desquamation of skin has not yet occurred.
(CV220)
27. Patient: saddle nose of Wegener s
granulomatosis
Note the flattened nose in this patient owing to
destruction of the nasal septum by granulomatous
inflammation. Congenital syphilis can also produce the
saddle nose deformity. (CV021)
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28. Patient: Raynaud s phenomenon
Note the white discoloration of some of the digits owing
to spasm of the digital vessels. (CV022)
29. Vessel: Mucormycosis
Vasculitis may be secondary to fungi that invade vessel
walls. Note the non-septate hyphae and wide-angled
branches of Mucor. Candida and Aspergillus can also
invade vessels. (CV023)
30. Stomach: hereditary telangiectasia (Osler-
Weber-Rendu disease)
The stomach close-up reveals a vessel dilatation in the
submucosa. A histologic section of the lesion exhibits
dilated vascular channels. These lesions bleed causing the
loss of blood in the stool. Similar lesions occur on the skin
and mucous membranes of the mouth. (CV024)
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
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31. Patient: spider angiomata
Note the tentacle-like appearance of this lesion.
Compression of the central portion of this lesion causes
the tentacles to disappear, hence this lesion is an
arteriovenous fistula. They are secondary to
hyperestrinism (pregnancy, cirrhosis of the liver).
(CV025)
32. Child: capillary hemangioma on the nose
These benign lesions that present at birth invariably
disappear with increasing age in the patient. Most
pediatricians recommend that they be left alone. (CV216)
33. Patient: Kaposi's sarcoma:
Note the raised, elongated red lesion on the neck. This
patient is HIV positive and has Kaposi's sarcoma, which is
due to HSV-8. Kaposi�s sarcoma is an AIDS-defining
lesion. (CV027)
34. Renal angiogram: left renal artery stenosis
Note the narrowing of the lumen of the proximal right
renal artery. The narrowing is due to an atherosclerotic
plaque. (CV028)
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35. Renal angiogram: bilateral fibromuscular
hyperplasia of the renal arteries
Note the "beaded" appearance in the right renal artery.
This is due to fibromuscular hyperplasia in the wall of the
renal artery (narrow lumen) alternating with a normal
sized lumen. (CV029)
36. Kidney: benign nephrosclerosis (BNS)
Note the cobblestoned surface of this kidney in a patient
with long-standing essential hypertension. BNS is the
kidney of hypertension. The cortical effect is secondary to
hyaline arteriolosclerosis (Slide 4) of the arterioles in the
cortex with subsequent tubular atrophy and glomerular
fibrosis. (CV030)
37. Retina: grade I hypertensive retinopathy
Note the narrow caliber of the retinal vessels. There is
very mild AV nicking (slightly to your left of the red line
going down the slide) where the large vessel at the top of
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the screen crosses a small venule. (CV031)
38. Retina: grade III hypertensive retinopathy Note
the flame hemorrhage (ruptured microaneurysm) directly
superior to the optic disc (pale area at 5 o'clock). The
white lesions (arrow) are well demarcated and represent
hard exudates (increased vessel permeability). There is no
papilledema. (CV032)
39. Retina: grade IV hypertensive retinopathy
Note the obliteration of the optic disc (papilledema, arrow
to center of the slide), flame hemorrhages, soft exudates
(white exudates with a fuzzy margin like cotton [cotton
wool exudates, arrow at 9 o'clock] representing
microinfarctions, hard exudates (white patch that is well
demarcated [arrow along the periphery of the slide at 3
o'clock] indicating increased vessel permeability. (CV033)
40. Hearts: normal heart on the left; concentric
hypertrophy on the right
Recall that concentric hypertrophy is due to an increase in
afterload (e.g., essential hypertension, aortic stenosis).
(CV034)
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Cardiovascular
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41. Heart: right and left ventricular hypertrophy
The left ventricle is on your left and the right ventricle on
your right. Note that both ventricles are thickened. One
possible explanation for RV hypertrophy is pulmonary
artery hypertension, which imposes an increased afterload
against the RV. (CV035)
42. Lungs: microscopic of pulmonary edema
Note the pink staining fluid (transudate) filling the alveoli.
Pulmonary edema occurs in left heart failure. (CV232)
43. Liver: congestive hepatomegaly ("nutmeg" liver)
Note the red dots scattered throughout the liver
parenchyma. These represent blood backed up into the
terminal hepatic venules (central vein) in a patient with
right heart failure. Recall the terminal hepatic venules
eventually coalesce to form the hepatic vein, which
empties into the vena cava, which empties into the right
heart. Hence an increase in systemic venous pressure
transmits back into the liver. (CV042)
44. Aorta: postductal coarctation of the aorta
Note the area of constriction just distal to the ligamentum
arteriosum (arrow) extending off the transected
pulmonary artery. The proximal aorta is dilated and the
posterior wall of the aorta hit by the jet-stream of blood
going through the narrow opening is also aneurysmally
dilated. You can trace a figure 3 lying on its side.
(CV043)
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45. Children: cyanotic congenital heart disease
Note the blue discoloration of the lips in these two
children, both of which have tetralogy of Fallot. Refer to
course notes for why these patients squat to relieve
cyanosis. (CV044)
46. Right coronary artery angiogram
RCA stenosis secondary to atherosclerosis. Note the area
of constriction (arrow) in the mid-portion of the coronary
artery. (CV045)
47. Heart: heart with coronary artery bypasses using
saphenous vein grafts
Note the 2 veins, one bypassing the LAD coronary artery
(arrow) and the other the RCA. (CV046)
48. Coronary artery: coronary artery atherosclerosis
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and thrombus occluding the lumen
Note the red thrombus overlying an atheromatous plaque
(arrow). The slit like spaces are where cholesterol used to
be present. (CV047)
49. Heart: anterior myocardial infarction
Note the pale infarct in the anterior portion of the left
ventricle (on your left) with extension into the anterior
2/3rds of the interventricular septum. This is the
distribution of the left anterior descending coronary
artery. (CV240)
50. Heart: coagulation necrosis of cardiac muscle in
an AMI
Note the eosinophilic staining cells with no cross striations
or nuclei. (CV049)
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
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51. Heart: microscopic section of a 3 day old acute
myocardial infarction
Unlike the previous slide, which showed the early stages
of coagulation necrosis, this slide depicts a heavy
neutrophilic infiltrate with destruction of the cardiac fibers.
The neutrophils came into the area of the infarct from the
periphery, so this should not be confused with liquefactive
necrosis. Macrophages will eventually replace the
neutrophils and then collagen tissue will be deposited in
the area of infarction. (CV241)
52. Heart: cardiac tamponade secondary to rupture
of the left ventricle in a patient with an AMI
At the apex of the heart, there is a rupture site in the
area of a transmural AMI. Blood fills the pericardial sac
and encircles the heart. (CV050)
53. Heart: rupture of the anterior wall of the left
ventricle in a patient with an acute myocardial
infarction
The rupture site is at 10 o'clock in the slide. The
pericardial sac is filled with blood. (CV255)
54. Heart: posteromedial papillary muscle rupture in
a patient with a right coronary artery thrombosis
A portion of papillary muscle hangs from the chordae
tendineae of the mitral valve. A biopsy of the muscle
shows coagulation necrosis. Recall that the right coronary
artery supplies this muscle. (CV254)
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55. Heart: rupture of the interventricular septum in a
patient with an acute myocardial infarction
A plastic stick marks the site of rupture in the IVS. Blood
flows from left to right and volume overloads the right
heart leading to right heart failure. The majority of IVS
ruptures are due to thrombosis of the LAD coronary
artery. (CV262)
56. Heart: fibrinous pericarditis post anterior acute
myocardial infarction
Note the shaggy exudate along the surface of the visceral
pericardium. This may be a complication of a transmural
infarction during the first week or an autoimmune
pericarditis 6-8 weeks later with autoantibodies directed
against pericardial tissue. This is called Dressler's
syndrome. (CV070)
57. Heart: mural thrombus on anterior wall of the
ventricle
Note the large thrombus occupying most of the lumen of
the left ventricle. A pale infarct overlies the thrombus. It
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is a mixed clot with the part attached to the endocardium
representing a platelet thrombus and the part projecting
into the lumen a "venous" type clot. (CV261)
58. Heart: ventricular aneurysm
Note the thin aneurysmal sac extending from the anterior
portion of the left ventricle. Very little functional muscle
tissue is left in the ventricle. These are late complications
and present with a precordial bulge of the anterior chest
with each systolic contraction. Rupture is uncommon,
since the tissue is scar tissue. Most patients die of heart
failure. (CV245)
59. Heart: scar tissue in an old anterior AMI
Note the completely calcified LAD coronary artery buried
in the epicardial fat. The white patchy area in the anterior
wall is fibrous tissue. (CV053)
60. Heart: sterile vegetations on the mitral valve in a
patient with acute rheumatic fever
Note the red, wart-like vegetations along the line of
closure of the valve (arrow). The vegetations are
examples of fibrinoid necrosis. (CV247)
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Pathology I Images
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61. Heart: Aschoff nodule
The Aschoff body is the pathognomonic lesion of
rheumatic fever. It consists of a collection of Anichkov's
myocytes (reactive histiocytes; in the center of the slide)
and Aschoff multinucleated giant cells (a few
multinucleated cells are visible) within an area of fibrinoid
necrosis (pink staining material surrounding the
histiocytes) located in the myocardium. (CV055)
62. Patient: erythema marginatum in a patient with
acute rheumatic fever
This skin rash is one of the five Jone's criteria for
diagnosing acute rheumatic fever. Note the erythematous
circular lesions with central areas of pallor. (CV248)
63. Heart: severe mitral stenosis with a dilated left
atrium containing a thrombus
Note the fixed, stenotic opening of the mitral valve (arrow
in low center). The chordae are thickened owing to scar
tissue formation. Stasis in the enlarged left atrium
predisposes to clot formation (arrow in top center). LA
dilatation predisposes to atrial fibrillation, which is
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responsible for breaking the clot up into small emboli.
(CV056)
64. Heart: mitral stenosis
You are looking down from the enlarged left atrium into
the orifice of the mitral valve. Note that it has a fishmouth
appearance. This patient probably had a significant
component of mitral insufficiency as well as stenosis.
(CV057)
65. Heart: mitral valve prolapse
Note the baggy-appearing mitral valve leaflets. When
blood collects beneath these voluminous valves, it projects
them into the left atrium like a parachute. When the
chordae abruptly stop the valves from moving any further,
a systolic click is heard followed by a murmur of mitral
insufficiency. (CV058)
66. Heart: mitral valve prolapse
Note the parachute-like redundancy of the mitral valve
and how it has prolapsed into the left atrium. A close-up
of the valve shows that one of the chordae has ruptured
causing the patient to develop acute mitral regurgitation,
and, in this case, death. (CV249)
67. Aortic valve: bicuspid aortic valve with associated
aortic stenosis
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Note that there are only 2 cusps when there should be 3.
The AV orifice is stenotic due to dystrophic calcification of
the valve leaflets (knobby appearing material). (CV060)
68. Heart: aortic stenosis with left ventricular
hypertrophy
The left atrium is at the bottom of the screen and the left
ventricle lumen is markedly diminished owing to LVH. The
aortic valve just above the left atrium is markedly
calcified. (CV250)
69. Heart: aortic insufficiency secondary to old
rheumatic heart disease
Note that the aortic valve is fibrotic and plastered against
the aorta, hence leaving an expanded AV orifice (blood
will leak back into the LV during diastole). As expected,
the LV was volume overloaded and exhibits both dilatation
and hypertrophy. (CV061)
70. Aortic valve: infective endocarditis complicating a
ventricular septal defect
A metal probe exits one of the two holes in the
membranous portion of the IVS. This represents a VSD.
Small vegetations line the valve cusps and the thread
extends through a hole in the valve that developed from
the infection. The edge of the other valve cusp looks half
Cardio Images 7
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eaten away. This underscores the increased incidence of
infective endocarditis in patients with an underlying
congenital defect. (CV264)
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Pathology I Images
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Cardiovascular
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71. Mitral Valve: acute infective endocarditis
The vegetations are on the atrial side of the valve leaflets.
Note the bulky vegetations and chordae tendineae that
has been ruptured. Staphylococcus aureus grew out in the
blood culture. (CV259)
72. Patient: splinter hemorrhages on your left and
Osler�s nodes on your right
This patient has acute infective endocarditis. Recall that
these lesions are an example of immunocomplex vasculitis
(type III hypersensitivity). (CV064)
73. Retina: Roth's spot in a patient with acute
infective endocarditis
Note the red lesion with a pale center (arrow). This
represents an immunocomplex vasculitis with hemorrhage.
(CV065)
74. Heart: Libman-Sack's endocarditis involving the
mitral valve in a patient with SLE
The warty vegetations located all over the valve and
portions of the chordae are sterile, just like those in acute
rheumatic fever. Both are examples of immunologic
damage leading to immune deposits in the valve and
fibrinoid necrosis. Pericarditis, rather than endocarditis, is
the most common cardial lesion in patients with SLE.
(CV257)
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75. Heart: congestive cardiomyopathy
Note the extreme dilatation of both the left (on your
right) and right ventricular chambers (on your left). The
patient had a previous history of a coxsackie myocarditis.
(CV066)
76. Heart: hypertrophic cardiomyopathy
Note the asymmetric thickening of the interventricular
septum when compared to the thickened free LV wall. The
anterior leaflet of the MV is stretched tautly and almost
touches the bulging interventricular septal muscle. Note
the very narrow orifice created by these two closely
approximated structures. When blood passes through this
narrow opening, the negative pressure behind it sucks the
anterior leaflet against the IVS muscle and obstructs
blood flow. (CV067)
77. Heart: restrictive cardiomyopathy secondary to
amyloidosis
Note the thickened myocardial tissue and the blotchywhite
deposits of amyloid in the muscle. The special stain
on the right demonstrates the blue-green staining amyloid
encasing and destroying the myocardial fibers. (CV068)
78. Heart: left atrial myxoma
Note the huge ball-like structure attached to the wall of
the left atrium. One can easily picture it dropping on top
of the MV orifice and obstructing blood flow (syncope
occurs) or pieces of the tumor embolizing into the
systemic circulation. (CV069)
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79. Heart: fibrinous pericarditis
This is a classic example of fibrinous inflammation
involving the visceral pericardium ("bread and butter"
pericarditis). Fibrinous inflammation is due to increased
vessel permeability leading to the leakage of a sterile
exudate with fibrin on to the surface of the heart. The
patient would likely have had a pericardial friction rub.
This particular patient had SLE. (CV070)
80. Chest x-ray: pericardial effusion
Note the "water bottle" configuration of the heart owing to
a collection of fluid in the pericardial sac. The patient had
a coxsackie myocarditis and pericarditis. (CV071)
81. Heart and Pericardium: constrictive pericarditis
secondary to TB
Note the caseous necrosis in the hilar lymph nodes
directly above the heart. The pericardium is markedly
thickened and has chalky white area most likely
representing dystrophic calcification. Note what little room
the heart has to expand with blood and why a pericardial
knock would likely be heard when the ventricle hit the
thickened parietal pericardium during diastole. (CV072)
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Respiratory 1
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Pathology I Images
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Respiratory
1 | 2 | 3 | 4 | 5 | 6
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1. Nasal passage: allergic
rhinitis
Note the pale boggy mucosa in
this patient with seasonal
allergies. (Res203)
2. Nasal smear in above
patient: eosinophils
A nasal smear of the above
patient reveals predominantly
eosinophils indicating the presence
of a type I hypersensitivity
reaction related to histamine
release from mast cells.
(Res202)
3. Laryngectomy: squamous
cell carcinoma
The epiglottis is at the top. The
false vocal cords are easily
identified on your right, then a
commissure, and then the true
vocal cords. To your left, you see
an ulcerated mass that has
obliterated the true and false
vocal cords. This is a squamous
cell carcinoma. Smoking is the
MCC followed by alcohol abuse.
The two of them are synergistic.
(Neo056)
4. Newborn lungs with hyaline
membrane disease (respiratory
distress syndrome)
RDS is due to a deficiency of
surfactant, which normally reduces
surface tension and keeps the
airways from collapsing on
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expiration. Note the collapsed
alveoli throughout all lung fields.
The ventilation defect related to
massive atelectasis results in
intrapulmonary shunting of blood
and severe hypoxemia. The pink
staining hyaline membranes are
due to necrotic type II
pneumocytes and fibrin from
fibrinogen. (Res261)
5. EM: type II pneumocyte with
lamellar bodies
Note the concentric, lamellar
bodies in the cytosol. These
contain surfactant. The type II
pneumocyte is also the repair cell
of the lungs. When destroyed, as
in RDS and ARDS, they contribute
to the formation of hyaline
membranes in both conditions.
(Res239)
6. Gram stain of sputum with
Streptococcus pneumoniae
Note the gram positive, lancet
shaped diplococci. S. pneumoniae
is the MCC of typical, community
acquired pneumonia and is treated
with penicillin G. (Res007)
7. Lung: bronchopneumonia
Note the yellow white patches
scattered throughout the lower
lobe. These represent foci of
consolidation in a patient with S.
pneumoniae bronchopneumonia.
(Res205)
8. Lung: lobar pneumonia
Note the pale consolidation of the
entire upper lobe. This is lobar
pneumonia, which is also most
commonly caused by S.
pneumoniae. (Res206)
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9. Chest x-ray: right upper lobe
lobar pneumonia
Note the consolidation in the right
upper lobe. Grossly, it would have
looked like the previous slide.
(Res240)
10. Lung biopsy: Warthin-
Finkeldey multinucleated giant
cell of measles
Measles pneumonia can be a
serious complication. These are
very characteristic giant cells that
accompany measles. Measles
along with adenovirus are also the
most common antecedent
infection predisposing to acute
appendicitis in children. A tip off
that measles was the cause is the
presence of these giant cells in
the inflammatory infiltrate of the
appendix. (Res243)
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Respiratory 2
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Pathology I Images
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Respiratory
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11. Gram stain of sputum in a
cardiac transplant patient with
pneumonia: Nocardiosis
Note the branched, gram positive,
aerobic bacteria within the
inflammatory infiltrate. These
organisms are partially acid fast,
unlike Actinomyces, which is a
gram positive strict anaerobe.
(Res208)
12. X-ray of lateral neck:
thumbprint sign of acute
epiglottitis due to Hemophilus
influenzae
Note the "thumbprint" appearance
of the swollen epiglottis.
Inspiratory stridor was present in
this child. (Res201)
13. Cavitary lesion in the right
upper lobe: reactivation
tuberculosis
Note the cavitary lesion lined by
caseous material. The apex has
the highest oxygen content, which
explains why TB, a strict aerobe,
enjoys this location. Cavitation
occurs, since the patient has
previously been exposed to TB,
which causes an intense
inflammatory reaction involving T
cells and their cytokines.
(Res244)
14. Acid fast stain in TB
Mycolic acid in the cell wall is
responsible for acid-fastness in
TB. (Res245)
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15. Chest x-ray with miliary
tuberculosis
Careful observation reveals small
densities throughout both lung
fields representing miliary spread.
This could have been due to a
caseous focus extending into a
bronchus or into the pulmonary
artery. (Res209)
16. Spherule with endospores:
Coccidioides immitis
Coccidioides is indigenous in the
southwestern states. Arthrospores
are inhaled in dust. (Res247)
17. Macrophage with
phagocytosed Histoplasma
capsulatum
Note the yeast forms of
Histoplasma in this macrophage in
the bone marrow. Histoplasma is
indigenous in the Ohio-Tennessee
valley. Starlings, bats, and caves
are the key words to remember.
(Res210)
18. Macrophage with
phagocytosed Histoplasma
capsulatum
Note the yeast forms of
Histoplasma in this alveolar
macrophage in the lung.
(Res246)
19. Verrucous skin lesion on
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the face: Blastomyces
dermatitidis
Note the raised, wart-like lesion
on the face. This is characteristic
of blastomycosis. (Res250)
20. Broad based bud of
Blastomyces dermatitidis
Blastomycosis frequents the
southern states. (Res251)
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Respiratory 3
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Pathology I Images
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21. Chest x-ray: bilateral apical
cavities containing the fungus
ball of Aspergillus fumigatus
Note the fuzzy appearance within
the apical cavities (old abandoned
TB cavities). These represent the
fungus balls of Aspergillus.
Massive hemoptysis is a potential
complication. (Res211)
22. PAS stain of Aspergillus
Note the classic corona of
Aspergillus. The hyphae are
septate and have narrow angles.
Aspergillus is a vessel invader.
(Res212)
23. PAS stain of Mucor
Note the non-septate, wide angled
hyphae of Mucor. Mucor is a
vessel invader. (Res213)
24. Section of lung with
Pneumocystis carinii
Note the foamy exudate in the
alveoli. This is the MC AIDS
defining infection. Pneumocystis is
a fungus. (Res214)
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25. Silver stain of
Pneumocystis carinii
Note the round and crushed cysts
in the lavage specimen from the
lungs of a patient with AIDS.
TMP/SMX is the Rx of choice.
(Res013)
26. Superior segment of the
right lower lobe: lung abscess
Note the cystic cavity lined by
purulent material (liquefactive
necrosis). The patient was an
alcoholic who aspirated
oropharyngeal material while
sleeping on his back. Mixed
aerobe/anaerobe organisms were
present in culture. (Res248)
27. Schematic of pulmonary
embolus
Pulmonary emboli can be large
leading to occlusion of the
pulmonary artery orifices (saddle
embolus) or small, the latter
resulting in wedge shaped
hemorrhagic infarctions
(coagulation necrosis). Most
emboli do not cause infarction
unless the patient has preexisting
lung disease. The majority of
pulmonary emboli come from the
femoral vein. (Res215)
28. Pulmonary artery: saddle
embolus
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Note the large embolus essentially
occluding the entire lumen of the
PA. This produces sudden death
due to acute right heart strain.
There is no time for infarction.
(Res216)
29. Hemorrhagic infarction of
the lung
Note the wedge shaped infarction
extending to the pleura (explains
pleuritic chest pain and presence
of a hemorrhagic pleural effusion).
The vessel occluded by an
embolus is located at the apex of
the infarct. (Res217)
30. Ventilation perfusion scan
in a patient with a pulmonary
embolus to the right lower lobe
(RLL)
The right lung is on your left. A
ventilation scan is on the top and
shows uptake of the scan material
in both lungs, however, note the
slightly fuzzy appearance at the
base of the RLL. The perfusion
scan is on the bottom and it
clearly shows a lack of perfusion
in the RLL. A V/P scan is the
initial test of choice to screen for
a PE. (Res252)
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Respiratory 4
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31. Histologic section of a
thickened pulmonary vessel in
a patient with pulmonary
hypertension (PH)
Note the small calibre lumen of
the vessel (space with RBCs). The
vessel wall is thickened owing to
hyperplasia and hypertrophy of
smooth muscle cells.
(Res253)
32. Normal heart on the right
and heart with right ventricular
hypertrophy (RVH) on the left
in a patient with PH
Note the thick right ventricular
wall on your left compared to the
normal right ventricular wall on
your right. It is thickened because
of the afterload it had to contract
against in the pulmonary vessel.
The combination of PH and RVH is
called cor pulmonale, if the PH is
secondary to primary lung disease
or a primary pulmonary artery
hypertension. PH secondary to
cardiovascular disease does not
qualify. (Res254)
33. Coal worker's
pneumoconiosis (restrictive
lung disease)
The black pigment is anthracotic
pigment. The dilated spaces
represent centrilobular
emphysema. There is an increase
in fibrous tissue throughout the
lungs (progressive massive
fibrosis) in between the areas of
emphysema. CWP is primarily a
restrictive type of lung disease,
however, there is a small
component of emphysema, which
is obstructive. Patients are
susceptible to TB but not cancer.
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(Res218)
34. Silicotic nodule in the lungs
in a patient with silicosis
(restrictive lung disease)
Note the solid areas of fibrous
tissue. If this was polarized, it
would reveal silica crystals
throughout the nodule. This
disease commonly occurs in
sandblasters. Patients are
susceptible to TB but not cancer.
(Res219)
35. Section of lung with
asbestos fibers (ferruginous
bodies, restrictive lung
disease)
Note the rusty colored, dumbbell
shaped bodies in the lung tissue.
These represent asbestos fibers
coated by iron. Benign pleural
plaques are the MC manifestation
of asbestos exposure. Primary
lung cancer is more common than
mesothelioma. Smoking +
asbestos exposure has a
synergistic effect on increasing
risk for lung cancer rather than a
mesothelioma. (Res220)
36. Mesothelioma (restrictive
lung disease)
Note that the entire lung is
encased by thickened pleura. This
is characteristic of a
mesothelioma, which is a highly
malignant tumor. It requires at
least 20-40 years for these to
develop, unlike primary lung
cancer, which explains why the
latter is more common. There is
no smoking relationship with
mesotheliomas. (Res221)
37. Hamman Rich lung
(restrictive lung disease)
HR lungs are the end result of an
alveolitis. Note the cystic spaces
resembling a honeycomb along
the outer portions of the lung.
Alveolar fibrosis leads to proximal
dilatation of the small airways.
Respiratory 4
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(Res257)
38. Chest x-ray in a patient
with sarcoidosis (restrictive
lung disease)
Note the markedly enlarged hilar
lymph nodes ("potato nodes").
Along both lung bases there is a
very fine reticulonodular pattern
representing interstitial fibrosis.
(Res256)
39. Non-caseating granuloma
in a hilar lymph node in a
patient with sarcoidosis
(restrictive lung disease)
Note the multinucleated giant cells
and the pink staining epithelioid
cells representing activated
macrophages. (Res255)
40. Pink puffer (left) and blue
bloater (right): obstructive
lung disease
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Pink puffers predominantly have
emphysema, which involves the
respiratory unit, while blue
bloaters have chronic bronchitis,
which primarily obstructs the
more proximal terminal
bronchioles, hence the greater
trapping of CO2 leading to
respiratory acidosis, hypoxemia,
and cyanosis (note facial
discoloration). (Res222)
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Respiratory 5
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41. Schematic of centrilobular
emphysema (obstructive lung
disease)
The respiratory bronchiole is the
primary site of destruction in this
type of emphysema. It is most
commonly due to smoking and
less commonly to CWP. The upper
lobes are primarily involved.
(Res223)
42. Schematic of panacinar
emphysema (obstructive lung
disease)
The entire respiratory unit is
destroyed in this type of
emphysema, which is due to a
deficiency of AAT. It may be
acquired in smokers and inherited
as an AR disease. The lower lobes
are primarily involved. (Res224)
43. Serum protein
electrophoresis in a patient
with hereditary AAT deficiency
(obstructive lung disease)
The top SPE pattern labeled C is
normal. Compare this to the lower
SPE labeled P. Note that the a1
globulin component is missing.
This is due to lack of liver
synthesis of the protein.
(Res226)
44. Bronchiectasis (obstructive
lung disease)
Note the dilated, pus-filled bronchi
extending to the pleural surface of
the lung. Obstruction and infection
weaken the bronchi causing them
to dilate. Cystic fibrosis is the
MCC in this country and TB in
other countries. (Res258)
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45. Main-stem bronchus cancer
associated with bronchiectasis
(obstructive lung disease)
At the top of the slide there is a
white colored mass that has
completely obstructed the mainstem
bronchus. Behind the
obstruction dilated, pus filled
bronchi extend to the pleural
surface. (Res047)
46. Patient with bronchial
asthma (obstructive lung
disease)
Note the increased anteroposterior
diameter in the patient. This is
due to air trapping behind the
inflamed terminal bronchioles.
(Res225)
47. Sputum with Charcot-
Leyden crystals in a patient
with bronchial asthma
(obstructive lung disease)
Note the spear-head shaped
crystals representing crystalline
material derived from degenerated
eosinophils. (Res200)
48. Chest x-rays: left x-ray
with a primary peripheral
adenocarcinoma, right x-ray
Respiratory 5
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with primary centrally located
cancer
Adenocarcinoma has replaced
squamous cancer as the MC
primary cancer. They are usually
(not always) peripherally located.
There are different variants of
adenocarcinoma, some of which
have no smoking relationship.
Centrally located cancers include
squamous cancer and small cell
cancer. (Res 228)
49. Primary main-stem
bronchus cancer
Toothpicks are necessary to keep
the lumen open. Note the white
material encircling and invading
into the lumen of the main-stem
bronchi. This could be either a
squamous or small cell cancer.
(Neo058)
50. Well differentiated
squamous cell carcinoma of
lungs
Note the concentric areas of
eosinophilic staining cells on the
lower margin of the side. These
are malignant squamous cells with
keratin formation (called
squamous pearls). (Neo202)
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Respiratory 6
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51. Pap smear of sputum with
squamous cancer
Keratin stains bright red with a
Papanicolaou stain. Note the
malignant cells in each of the
frames and the intense staining of
the keratin. Squamous cancers
may ectopically secrete PTH-like
peptide leading to hypercalcemia.
(Res229)
52. Pap smear with a
malignant squamous pearl
Note the concentric appearance of
this malignant cell containing
keratin. (Res231)
53. Lung biopsy in a patient
with a small cell carcinoma
Note the diffuse infiltrate of small,
dark cells throughout the tissue.
Small cell cancers are of neural
crest origin (neurosecretory
tumors) and ectopically secrete
ADH or ACTH in some cases.
(Res232)
54. Pap smear of small cell
cancer in sputum
The small cells resemble
lymphocytes, hence they are
frequently missed in sputum
cytology. (Res233)
55. Lung with metastatic
disease
Note the multifocal nature of
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metastasis. Primary lung cancers
are usually solitary. Breast cancer
is the MC malignancy
metastasizing to lungs. (Res235)
56. Lung with metastatic
disease along the visceral
pleural surface
Note the white nodular masses
lining the pleura on your left.
(Res259)
57. Lung with metastatic
disease in lymphatics
surrounding airways
Note the white tumor encircling
small airways throughout the
lungs. This produces intense
dyspnea in the patient. (Res237)
58. Patient with Horner's
syndrome
The patient has a Pancoast
tumor (superior sulcus tumor),
which is most often due to a
primary squamous cancer at the
lung apex involving the brachial
plexus and superior cervical
ganglion. Destruction of the
superior cervical ganglion, located
in the posterior mediastinum,
produces Horner's syndrome.
Horner's syndrome includes
ipsilateral lid lag (drooped right
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eyelid), miosis (look hard and
note that the right pupil is
constricted compared to the left),
and anhydrosis (absence of
sweating). (Res234)
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gastrointestinal1
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Gastrointestinal
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1. Cleft palate
Due to failure of fusion of the facial processes in the
embryonic period. (Gi200)
2. Herpes simplex
Note the vesicular lesions above the vermilion border
of the lip. The virus remains dormant in the cranial
sensory ganglia. (Gi201)
3. Exudative tonsillitis
Note the pus covering both tonsils. The majority are
viral in origin. Streptococcus pyogenes is the MC
bacteria. (Gi263)
4. Hairy leukoplakia
Note the white plaque-like material on the lateral
border of the tongue. It is a pre-AIDS EBV infection of
the tongue. It is not precancerous. (GI261)
5. Oral thrush
Note the white exudate on the dorsal surface of the
tongue. This patient is HIV positive. Oral thrush occurs
gastrointestinal1
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as a pre-AIDS infection and is not AIDS-defining.
(Gi208)
6. Oral thrush in a child
See above description (Gi008)
7. Stain of Candida albicans
Note the pseudohyphae and budding yeasts surrounded
by an inflammatory infiltrate. (Gi009)
8. Draining sinus of Actinomyces
This patient had a dental abscess with tooth extraction
a few weeks ago and now has a sinus draining pus.
Yellowish granules are noted which contain the gram
positive filamentous bacteria. The organism is a strict
anaerobe. (Gi205)
9. Pseudomembrane of Corynebacterium
diphtheriae
Note the toxic induced white pseudomembrane in the
trachea. It is a non-invasive bacteria. Pathogenesis is
similar to pseudomembranous colitis caused by the
toxin of Clostridium difficile. (Gi206)
gastrointestinal1
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10. Scarlet fever
This slide shows a coated tongue with hyperemic
fungiform papillae. This is predominantly a disease of
children and is caused by several strains of �-
hemolytic Streptococci. The organism produces an
erythrogenic toxin with an associated rash.
STRAWBERRY TONGUE. (Gi013)
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gastrointestinal2
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Pathology I Images
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Gastrointestinal
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11. Scarlet fever
This slide shows a tongue with the
white material sloughed off. The
underlying tongue appears red
with hyperemic fungiform
papillae. This is called a
RASPBERRY TONGUE. (Gi011)
12. Dental caries
Note the black discoloration at the
gingival margins. This represents
a breakdown of the enamel of the
teeth secondary to an interaction
of bacteria, saliva, and dietary
substances. (Gi015)
13. Child with mumps
Note the bilateral parotitis.
(Gi216)
14. Leukoplakia (right frame)
and invasive squamous cancer
(left frame)
gastrointestinal2
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leukoplakia is a clinical description
for a white (sometimes red)
plaque that does not scrape off.
Biopsy is always necessary to
exclude squamous dysplasia vs
cancer. Invasive cancer in the
tongue on your left is noted by
change in color of the right half of
the tongue. (Neo064)
15. Squamous cell carcinoma of
lower lip
Note the raised crusted lesion on
the lower lip. As a rule, squamous
cancers frequent the lower lip and
basal cell carcinoma the upper lip.
(Gi213)
16. Pleomorphic adenoma
(mixed tumor) of the parotid
Note the swelling at the angle of
the jaw. This is the MC benign
tumor of the major and minor
salivary glands. (Gi214)
17. Zenker's diverticulum of the
esophagus
Note the pouch (pulsion
diverticulum) behind the
esophagus. (Gi217)
18. Tracheoesophageal
diverticulum schematic
Note that the proximal esophagus
ends blindly and the distal
esophagus arises from the trachea
(reason for air in the stomach).
Mothers have polyhydramnios.
(Gi218)
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19. Cytomegalovirus infection
of the esophagus
Note the enlarged cell with a
nucleus containing a large
intranuclear basophilic inclusion.
This is characteristic of CMV which
is a common pathogen in AIDS
patients. (Gi037)
20. Achalasia
This is a gross specimen from a
case of achalasia. Note that the
wall of the esophagus is thickened
or hypertrophic. The failure of
the lower esophageal sphincter to
relax is related to a decrease in
the numbers of ganglion cells.
(Gi016)
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gastrointestinal3
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Pathology I Images
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Gastrointestinal
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21. Achalasia: See above
description. (Gi219)
22. Reflux Esophagitis
This is the most common type of
esophagitis. There is acid chemical
damage to the mucosa of the
esophagus, owing to relaxation of
the LES. Barrett's esophagus is a
complication of GERD and
predisposes to distal
adenocarcinoma. (Gi017)
23. Esophageal varices
Note the distention of the
esophageal submucosal veins
associated with portal hypertension.
The left gastric vein is primarily
involved. (Gi021)
gastrointestinal3
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24. Mallory-Weiss syndrome
Note the lacerations in the upper
stomach and lower esophagus.
This syndrome is seen in alcoholics
and bulimics followed by retching
and vomiting. (Gi224)
25. Esophageal squamous cell
carcinoma of mid-esophagus
Note the complete obstruction of
the esophageal lumen by white
tumor. It has metastasized to the
lymph nodes on the opposite side.
Smoking and alcohol are the major
risk factors. (Neo066)
26. Squamous cell carcinoma
This slide shows an annular
carcinoma of the esophagus which
is extending into the surrounding
gastrointestinal3
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tissues. Tissues in the regional
area include trachea and aorta.
(Gi023)
27. Congenital Pyloric stenosis
This gross specimen of stomach
shows hypertrophy of the pyloric
sphincter with accompanying
hypertrophy of the wall of the
stomach. (Gi024)
28. Acute hemorrhagic (erosive)
gastritis
These ulcers are frequently multiple
and are well-delineated craters of
variable depth, usually below the
muscular mucosa. They tend to
bleed profusely. Associations
include NSAIDs, debilitating
illnesses, sepsis, and trauma.
(Gi025)
29. Chronic atrophic gastritis
Note the atrophy of the rugal folds
in this gross specimen of stomach.
This is a descriptive diagnosis and
the etiology is variable ranging from
Helicobacter pylori infection
(involves pylorus and anthrum) to
pernicious anemia (involves body
and fundus). (Gi026)
30. Chronic atrophic gastritis
This microscopic section shows
atrophy of the stomach mucosa
with an infiltrate of chronic
inflammatory cells. (Gi027)
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gastrointestinal4
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Pathology I Images
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Gastrointestinal
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31. Helicobacter pylori gastritis
This slide demonstrates the gram-negative
pleomorphic organism (stained with a silver
stain) setting on the mucosal surface of the
stomach. The organism is not invasive.
(Gi028)
32. Menetrier's disease
Note the giant rugal folds. Patients lose
protein in the mucus secretions. (Gi264)
33. Gastric ulcer
This slide demonstrates a gastric ulcer with
hemorrhage in the base of the ulcer. The
margins are uniform and cookie-cutter like.
Most are located on the lesser curvature of
the pylorus and antrum. (Gi066)
34. Gastric ulcer
This is a microscopic section of a healed
gastric ulcer with fibrosis. (Gi031)
35. Leiomyoma
This is a benign smooth muscle tumor in the
stomach which may occasionally bleed. The
stomach in the most common location in the
GI tract for this lesion. (Gi032)
gastrointestinal4
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36. Linitis plactica (adenocarcinoma of
the stomach) (signet ring carcinoma)
This tumor invades the wall of the stomach
producing a desmoplastic response. The
stomach becomes hard like a leather bottle.
This tumor presents late in its course and
has a tendency to metastasize to the ovaries.
(Neo068)
37. Krukenberg's tumor
This is a mucin stain of signet ring cells in
the ovary. The tumor is a metastatic gastric
carcinoma which has spread to the ovaries.
(Neo069)
38. Gastric adenocarcinoma
Note the large ulcerated lesion in the
stomach. (Gi266)
39. Celiac disease
Note the flattened villi and hyperplastic
glands. Autoantibodies are directed against
the gliadin fraction in gluten. (Gi265)
40. Dermatitis herpetiformis
Nnote the vesicular lesion on the elbows.
This skin disorder has a high association with
celiac disease. (Gi267)
gastrointestinal4
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Pathology I Images
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Gastrointestinal
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41. Whipple's disease
Note the foamy macrophages in the lamina propria
of the small bowel. (Gi268)
42. Whipple's disease
EM of the bacteria in the macrophages. (Gi228)
43. Mycobacterium avium intracellulare
This is a higher magnification of an acid-fast stain
from a case of MAI in an AIDS patient. The disease
simulates Whipple's disease in that it produces
malabsorption. (Gi229)
44. Child with rotavirus infection
Note the volume depletion (Gi230)
gastrointestinal5
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45. Shigellosis with pseudomembranes
Note the shaggy pseudomembranes (Gi231)
46. Pseudomembranous colitis due to
Clostridium difficile
Note the shaggy membrane due to toxin-induced
damage of the mucosa and submucosa. (Gi269)
47. Flask shaped ulcer in cecum in amebiasis
Note the centrally located area of ulceration due to
Entameba histolytica. (Gi271)
48. Amebiasis
This slide shows a colon biopsy on the right and a
high magnification of amebic trophozoites on the
left. The characteristic of the trophozoite is
erythrophagocytosis. (Gi036)
gastrointestinal5
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49. Giardiasis
This slide shows Giardia trophozoites. The
organism is a flagellated protozoan that produces
diarrhea, cramps, flatulence, and malabsorption by
infecting the small intestine. (Gi270)
50. Cryptosporidiosis
Note the blue staining oocysts. They are acid-fast.
(Gi272)
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Pathology I Images
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Gastrointestinal
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51. Necator (hookworm)
infestation of the bowel
Note the worms attached to the
surface of the mucosa. Iron
deficiency is a complication.
(Gi235)
52. Ascariasis of bowel
Note the conglomeration of
worms that obstructed the
bowel lumen. (Gi236)
53. Trichuriasis
Note the thread-like worms
attached to the bowel mucosa.
Rectal prolapse is common.
(Gi237)
54. Strongyloidiasis
Note the adult worms
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embedded in the bowel
mucosa. (Gi239)
55. Enterobiasis (pinworm)
Note the characteristic
embryonated egg with a flat
side. (Gi240)
56. Bowel adhesion
Note the constriction in the wall
of the bowel which has trapped
several seeds. Obstruction in
the bowel is most often due to
adhesions post surgery.
(Gi045)
57. Hirschsprung's disease
The frame on your left depicts
ganglion cells and the one on
your right the absence of
ganglion cells in the
rectosigmoid. (Gi243)
58. Volvulus
Note how the colon is twisted
around the mesentery. (Gi246)
59. Schematic of
intussusception
Note how the terminal ileum
has intussuscepted into the
cecum. (Gi244)
gastrointestinal6
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60. Intussusception
The sausage shaped mass in
the lumen of the cecum is the
terminal ileum (Gi274)
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Pathology I Images
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Gastrointestinal
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61. Gallstone ileus
A chunk of liver and thickened gallbladder is on
the left. There is an opening between the
gallbladder and the small bowel lumen. The black
stone used to be in the gallbladder but passed
through the fistula and is now in the small
intestine lumen. Air would be present in the biliary
tree. (Gi245)
62. Radiograph with the air fluid levels and
step-ladder effect of a small bowel obstruction
self explanatory (Gi273)
63. Crohn's disease
This slide shows a gross specimen of Crohn's
disease demonstrating fissuring, serpiginous ulcers
and cobblestone mucosa. (Gi174)
64. Crohn's disease
This slide demonstrates cobblestone change in the
gastrointestinal7
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mucosa of the colon. (Gi252)
65. Crohn's disease
Note the thickened terminal ileum emptying into
the cecum. The lumen is extremely narrow and
would show up as a string sign on a barium
enema. (Gi279)
66. Crohn's disease
Note the ill-defined non-caseating granuloma to
the right of the gland lumen (Gi280)
67. Ulcerative colitis
Note the islands of red, inflamed mucosa
representing pseudopolyps and the gray-yellow
ulcerated mucosa (Gi281)
68. Ulcerative colitis
This slide is a gross specimen from a case of UC.
Note the hemorrhagic ulcerated appearance of the
mucosa and the continuous involvement without
skip areas. (Gi042)
69. Ulcerative colitis
Note the crypts filled with neutrophils. (Gi282)
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70. Infarcted small bowel
note the localized hemorrhagic infarction of the
small bowel. It may have been entrapped in the
external inguinal canal of an indirect inguinal
hernia. (Gi275)
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gastrointestinal8
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Pathology I Images
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Gastrointestinal
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71. Ischemic stricture at
splenic flexure
Note the thick wall of the bowel
and narrow lumen from repeated
small infarcts with repair by
fibrosis. (Gi276)
72. Angiodysplasia of cecum
Note the dilated vessels in the
submucosa. One opens into the
lumen at the top of the slide.
(Gi277)
73. Diverticulosis
This gross specimen demonstrates
the development of diverticuli
where the artery penetrates the
muscular wall of the colon.
(Gi043)
74. Diverticulosis
This slide is a microscopic section
of a diverticulum in the colon.
Note that the wall of the
diverticulum does no contain all
layers of the colon wall, which
makes it a false diverticulum.
(Gi044)
75. Barium enema with
diverticulosis
Note the numerous outpouchings.
gastrointestinal8
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(Gi278)
76. Carcinoid tumor
This slide shows a gross and
microscopic section of an
appendiceal carcinoid tumor. The
photograph on the left shows the
tail of the appendix with the
carcinoid tumor at the tip. The
slide on the right shows a crosssection
of the well demarcated
tumor. Most carcinoid tumors in
the appendix are asymptomatic.
(Gi046)
77. Carcinoid tumorneurosecretory
granules
The arrows point to dark staining
cytoplasmic organelles which are
features of neuroendocrine tumors.
(Neo071)
78. Familial polyposis
This autosomal dominant condition
is associated with multiple tubular
adenomas and tubulovillous
tumors in the colon. The patient
has greater than 100 polyps and is
at risk for colon cancer. There is
an association with the APC tumor
suppressor gene. (Neo072)
79. Hyperplastic polyps
This slide also shows multiple
hyperplastic polyps, most being
sessile (without a stalk). (Gi48)
80. Juvenile polyp
gastrointestinal8
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This is a hamartomatous polyp
which is solitary and occurs mostly
in the rectum. Juvenile polyps
readily undergo torsion and
present with rectal bleeding. They
also frequently self-amputate.
(Gi049)
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Pathology I Images
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Gastrointestinal
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81. Tubular adenoma
There are four slides demonstrating a tubular
adenoma. The slide on the upper left is an
endoscopic view of the pedunculated tumor. A
barium outlines the polyp. The last two slides
show the pedunculated polyp. There is a slight
risk of malignant transformation with tubular
adenomas. (Neo073)
82. Tubular adenoma
This is a microscopic section of a neoplastic
polyp arising from the colon mucosa. The polyp
is pedunculated and is composed of colonic
glands which have lost many of the normal
goblet cells. This is called an adenomatous
change. (Neo003)
83. Villous adenoma
This slide demonstrates the velvety appearance
of a villous adenoma of the colon.
(Gi051)
84. Villous adenoma
This is a microscopic section of a villous
adenoma. Note the long stalk-like papillary
projections of the tumor. These tumors are
typically sessile and have a high incidence of
malignant transformation. (Neo074)
85. Adenocarcinoma of colon
This tumor is a fungating mass with central
necrosis which arises from colonic mucosa. It
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tends to infiltrate the wall of the colon in a
"napkin-ring" fashion producing obstruction.
Obstructive lesions occur in the descending
colon. (Neo075)
86. Adenocarcinoma of the colon
This lesion is growing as a polypoid mass into
the lumen of the ascending colon. Right sided
colonic masses typically present with anemia and
bleeding. (Neo076)
87. Acute appendicitis with fecalith
Fecaliths are more commonly associated with
adult rather than childhood appendicitis, which is
more often secondary to a viral infection
(measles, adenovirus). (Gi285)
88. Acute appendicitis
Note the purulent material covering the surface
of the appendix. (Gi284)
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Pathology I Images
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Hepatobiliary
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1. Kernicterus
Note the yellowish discoloratioin representing free
UCB (not bound to albumin) in the brain. The
child had Rh incompatibility. (Hep001)
2. Viral hepatitis with Councilman body
(apoptosis)
Note the deeply eosinophilic, anucleate hepatocyte
that has undergone apoptosis (individual cell
death). The cord-sinusoid-cord pattern of the liver
is disrupted by regenerating hepatocytes.
(Hep002)
3. Viral hepatitis with bridging necrosis
Note the round cell infiltrate that streams out from
a portal triad. This is called bridging necrosis and
will likely end up as bridging fibrosis, which is a
band histologic sign (chronic hepatitis). The
infiltrate in viral hepatitis is lymphocytic (cytotoxic
T cells), while in alcoholic hepatitis it is
neutrophilic. (Hep003)
4. Chronic persistent viral hepatitis with a
portal "triaditis"
Note the frame on the left with the well
circumscribed infiltrate of lymphocytes in the triad.
The limiting plate separating the triad from the
parenchyma is intact and no inflammation is noted
in the parenchyma. CPH due to chronic HBV
corresponds with a "healthy carrier" state and
usually subsides with reappearance of anti-HBs
antibodies. (Hep004)
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5. High power of the limiting plate of a patient
with chronic aggressive (active) hepatitis B
Note that the lymphocytic infiltrate obscures the
line of demarcation between triad (top) and
parenchyma (bottom). This is a bad sign and is
usually associated with the infected carrier state
and a greater chance for progression into
postnecrotic cirrhosis. (Hep005)
6. Multiple liver abscesses
Note the shaggy craters (liquefactive necrosis) and
pus in some of the cavities. (Hep008)
7. Nutmeg in cross-section
Note the similarity of a real nutmeg to a nutmeg
liver. (Hep014)
8. Congestive hepatomegaly ("nutmeg
liver"): The red dots represent congested terminal
hepatic venules. Right heart failure is the most
common cause. (Hep015)
9. Hydatid cyst in the liver.
Note the grape-like hydatids associated with
Echinococcus granulosis. (Hep018)
10. Entamoeba histolytica
Note the trophozoites with erythrophagocytosis, a
pathognomonic finding with this protozoal disease.
(Hep019)
hepatobiliary1
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Hepatobiliary
1 | 2 | 3 | 4 | 5 | 6
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11. Liver infarction (microscopic)
Note the outlines of dead hepatocytes indicating
classic coagulation necrosis. It is likely that students
could mistake this for a granuloma. (Hep021)
12. Fatty change in the liver (microscopic) The
triad is to the right and the THV surrounded by fatty
change (zone III) to the left. Since zone III has the
least amount of oxygenated blood (blood flows from
the triad to the THV), hepatocytes in this zone are
most likely susceptible to hypoxia, alcohol, and other
toxic insults. (Hep023)
13. Alcoholic hepatitis
Note the blotchy eosinophilic staining Mallory bodies
at 2-, 6-, and 10 o'clock. The clear spaces are fatty
change and the infiltrate is neutrophils. (Hep024)
14. Stone in the common bile duct and
extrahepatic cholestasis
Note the round yellow stone blocking the CBD
(sponge is pushing it up) before it empties into the
duodenum. The duct is dilated and the liver is
green, indicating complete obstruction.
Hyperbilirubinemia would primarily be due to CB and
the stools would be clay colored. (Hep026)
15. Cross-section of the above liver
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Note the mottled dark green appearance of the liver
parenchyma. (Hep027)
16. Primary biliary cirrhosis
Note the round cell infiltrate in the triad. The limiting
plate is destroyed. This is stage 2, where there is
bile duct proliferation. Eventually the ducts will be
destroyed and jaundice will become evident in the
patient. (Hep030)
17. Prussian blue stain of a liver in a patient
with hemochromatosis
Note the abundant blue staining iron deposited in the
hepatocytes, Kupffer cells, and in the fibrous bands
surrounding micronodules of regenerating liver
(micronodular cirrhosis). (Hep031)
18. Prussian blue stain of pancreas and
unstained pancreas in a patient with
hemochromatosis
Note the intense blue staining of the pancreas and
the abundant amount of fibrous tissue replacement of
the gland. Exocrine deficiency occurs before
endocrine deficiency. (Hep032)
19. Hyperpigmented patient with
hemochromatosis
Note the brownish discoloration of the skin secondary
to melanocyte stimulation by iron and iron itself
deposited in the dermis. (Hep033)
20. Kayser-Fleischer ring in Wilson's disease
Note the copper colored rim around the outside of
the eye. (Hep034)
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Hepatobiliary
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21. Lipofuscin pigment in the liver.
Note the brown colored pigment in the hepatocytes
representing undigestible lipid. Special stains would
have to be performed to rule out other pigments
before this could be called lipofuscin. (Hep037)
22. Intranuclear deposition of glycogen in the
hepatocyte:
The material would be PAS positive. (Hep038)
23. Diffuse intranuclear deposition of glycogen
in hepatocytes (Hep039)
24. Globules of PAS positive AAT in a liver from
a child with neonatal cholestasis secondary to
AAT deficiency (Hep040)
25. EM showing mitochondrial swelling in the
hepatocytes of a child with Reye's syndrome
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(Hep043)
26. Mixed micro- and macronodular alcoholic
cirrhosis
Note the diffuse nature of the disease and the
regenerative nodules. (Hep044)
27. Close-up of postnecrotic (macronodular)
cirrhosis in a patient with chronic HBV (Hep045)
28. Histologic section of a mixed micro-,
macronodular cirrhosis
Note the thin bands of fibrosis and inflammation.
(Hep046)
29. Esophageal varices
Note the dilated veins in the submucosa and areas of
hemorrhage. (Hep047)
30. Jaundiced patient with fulminant hepatic
failure. (Hep048)
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Hepatobiliary
1 | 2 | 3 | 4 | 5 | 6
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31. Gynecomastia in the right breast of a
patient with alcoholic cirrhosis. (Hep049)
32. Palmar erythema (hyperestrinism) in a
male with cirrhosis of the liver. (Hep050)
33. Close-up of a spider angioma in a male
with cirrhosis of the liver
These are AV fistulas and will disappear when the
central portion of the lesion is compressed.
(Hep051)
34. Feminized male with cirrhosis
Note bilateral gynecomastia and the female
distribution of pubic hair. (Hep052)
35. Glossitis (folate deficiency) and
Dupuytren's contracture in an alcoholic
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Dupuytren's contractures are a fibromatosis of the
palmar tendon sheath with subsequent contraction
of the fingers. It is commonly seen in alcoholics.
(Hep054)
36. Schematic of the portal vein system.
(Hep055)
37. Serum protein electrophoresis with a bg-
globulin bridge in a patient with alcoholic
cirrhosis
Alcoholics have an increase in IgA and IgG. IgA
migrates at the junction of the b-g peaks, hence
filling in the valley between the two peaks. Note
the diffuse elevation of the g-globulin region from
the increase in IgA. This pattern is
pathognomonic for alcoholic cirrhosis. (Hep056)
38. Endoscopy showing metastatic tumor
nodules on the liver surface. (Hep057)
39. Liver with multiple metastatic nodules.
(Hep058)
40. Micronodular cirrhosis with
hepatocellular carcinoma
Note the large mass at one corner of the liver.
This underscores the relationship of a background
of cirrhosis in the development of hepatocellular
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carcinoma. (Hep059)
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Pathology I Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Hepatobiliary
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41. Jet black calcium bilirubinate stones in a
patient with an extravascular hemolytic
anemia (Hep064)
42. Ultrasound showing a single stone in the
gallbladder (white arrows) (Hep065)
43. Chronic cholecystitis with a thick wall
and a lumen containing yellow cholesterol
stones. (Hep066)
44. Gallbladder cancer
Note the white sheets of tumor and metastasis to
the cystic duct lymph node (cut in half).
Gallstones are present. (Hep067)
45. CT scan showing a porcelain gallbladder
This is dystrophic calcification of a chronically
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inflamed gallbladder. It predisposes to gallbladder
cancer and is always electively removed.
(Hep068)
46. Pancreas in a patient with cystic fibrosis.
Note the dilated ducts filled with pink material.
The surrounding parenchyma is fibrotic.
(Hep069)
47. Trichome stain showing bridges of
collagen connecting one triad with the next in
a patient with cystic fibrosis and secondary
biliary cirrhosis. (Hep070)
48. Acute pancreatitis
Note the duodenum and the hemorrhagic
pancreas with focal chalky white areas
representing enzymatic fat necrosis. The
duodenum juxtaposed to this inflamed pancreas
would likely have lacked peristalsis and would
dilate with air producing a classic sentinel loop on
a x-ray. Sentinel loops occur wherever there is
localized inflammation in the bowel (e.g.,
pancreatitis, retrocecal appendicitis). (Hep071)
49. Hemorrhage into the flanks (Gray-Turner
sign) in a patient with hemorrhagic
pancreatitis. (Hep072)
50. Stippled calcification (dystrophic) in the
pancreas in a patient with chronic
pancreatitis. (Hep073)
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Pathology I Images
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Hepatobiliary
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51. Carcinoma of the head of pancreas with
local invasion of the duodenal wall. (Hep074)
52. Carcinoma of the head or pancreas with
local invasion of the duodenal wall. (Hep075)
53. Dilated and inflamed veins representing
Trousseau's superficial migratory
thrombophlebitis in a patient with pancreatic
cancer. (Hep076)
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Pathology II Images
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Renal
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1. Horseshoe kidney
This specimen shows fusion of the lower poles of the
kidney. Note that the kidney is trapped by the inferior
mesenteric artery. Patients are also predisposed for
infections and stone formation. This syndrome is associated
with Turner's syndrome. Notice also the large cystic
structure at the upper portion of the specimen. This is a
simple retention cyst. (Ren265)
2. Autosomal recessive polycystic renal disease
This is an autopsy from an infant with bilateral markedly
enlarged cystic kidneys. This is a very common cause of a
palpable abdominal mass in a newborn and the kidneys may
reach such a large size that it may impede delivery of the
infant. It is incompatible with life. Mothers have
oligohydramnios. (Ren005)
3. Potter's facies
This infant has low set ears, beak-like nose, and a receding
chin. This syndrome is associated with bilateral autosomal
recessive polycystic renal disease, renal dysplasia and renal
agenesis. (Ren001)
4. CT scan of kidneys in adult polycystic kidney disease
Note the bilaterally enlarged and cystic kidneys as well as
cysts in the liver. (Ren264)
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5. Autosomal dominant polycystic kidney disease
(adult polycystic renal disease)
This slide is a gross specimen showing an enlarged cystic
kidney. This is the most common inherited renal disease.
It has an aberrant gene on the short arm of chromosome
16. Patients present in the fourth decade with
hypertension and progress into renal failure within 10 years.
(Ren079)
6. Normal glomerulus
This light microscopic photograph shows a normal
glomerulus with the normal number of cells. Remember
that within the glomerulus there are endothelial cells and
visceral epithelial cells with podocytes which share the
basement membrane. These are mesangial cells and a
small amount of mesangila matrix in a normal glomerulus.
The cells lining Bowman's space are called parietal epithelial
cells. (Ren085)
7. Normal glomerulus-electron micrograph
This slide shows 2 capillary lumens (CL) and associated
endothelial cells. These are podocytes on epithelial side of
the basement membrane. M designates mesangial cell.
(Ren020)
8. Normal glomerulus-electron micrograph
This slide demonstrates podocytes or foot processes of the
visceral epithelial cell on the right side of the basement
membrane. Lining the basement membrane on the
opposite side of the basement membrane are endothelial
cell cytoplasmic extensions. (Ren021)
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9. Linear immunofluorescence in a patient with anti-
GBM antibodies
The patient has Goodpasture's syndrome. Type II hypersensitivity
reaction. (Ren290)
10. Lumpy bumpy (granular) immunofluorescence in
immuno-complex type III glomerulonephritis.
(Ren291)
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Pathology II Images
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Renal
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11. Acute diffuse proliferative glomerulonephritis
The glomerulus shows an increase in the number of cells
(hypercellularity). The basement membranes are not
thickened. This is consistent with a proliferative
glomerulonephritis and it is diffuse since it involved all of
the glomeruli in the renal biopsy. This biopsy is from a
patient with acute post-streptococcal glomerulonephritis
(nephritic syndrome). (Ren214)
12. Acute diffuse proliferative glomerulonephritis
This is an electron micrograph which shows electron dense
deposits (look like balls) on the epithelial side of the
basement membrane. This is consistent with the the
subepithelial deposits of acute post streptococcal
glomerulonephritis. (Ren268)
13. Immunofluorescent study (serum antinuclear
antibody study)
This is a fluorescent antinuclear antibody study
demonstrating a rim pattern around the nucleus in a
patient with systemic lupus erythematosus. Rim patterns
correlate with anti-dsDNA and the presence of acute
glomerulonephritis in SLE patients. (Ren293)
14. Systemic lupus erythematosus
This is a light microscopic section of a glomerulus with
thickening of the basement membranes which is
particularly prominent around capillaries. This is called
wire-looping of the capillaries. The depositions are
composed of circulating immune complexes of DNA plus
antibodies directed against DNA which have been deposited
in the subendothelial portion of the basement membrane.
(Ren292)
15. Systemic lupus erythematosus
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This demonstrates a subendothelial deposition of immune
complexes in the basement membrane of the glomerulus.
This deposition is responsible for the wire-looping pattern
noted in the previous slide. (Ren269)
16. Rapidly progressive crescentic glomerulonephritis
(nephritic)
Note the crescent shaped proliferation of parietal epithelial
cells encroaching on the glomerulus. This is the worst type
of glomerulonephritis and is the type associated with
Goodpasture's syndrome. (Ren270)
17. Goodpasture's syndrome (nephritic)
This is a section of pulmonary parenchyma showing many
red blood cells collected within alveolar spaces. This type
of hemorrhage is classic for Goodpasture's disease and
produces the hemoptysis that is the first presentation in
these patients prior to their developing renal disease.
(Ren080)
18. Goodpasture's syndrome (nephritic)
This is a section of kidney that shows many red blood cells
contained within the tubules in the kidney. Most patients
with Goodpasture's are young males. The pathogenesis of
Goodpasture's is related to formation of antibasement
membrane antibodies which are directed against glomerular
and pulmonary capillary alpha-3 chains of type IV collagen
in the basement membrane. Immunofluorescence shows a
smooth linear pattern of IgG, C3 and fibrin. (Ren081)
19. Lipoid nephrosis
This is an electron micrography from a case of nephrotic
syndrome in a child. Note the widespread fusion of the
foot processes on the epithelial side of the GBM. This is
the most common cause of nephrotic syndrome in children.
There is a loss of the negative charge in the GBM.
(Ren271)
20. Focal segmental glomerulosclerosis (nephrotic)
Note how only part of the glomerulus is sclerotic. VEC's are
destroyed, which destroys the GBM. This is the MC type of
glomerular disease in HIV patients and intravenous drug
abusers. (Ren216)
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Pathology II Images
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21. Membranous glomerulonephritis-nephrotic
syndrome (nephrotic)
This is a light microscopic section of kidneys showing a
glomerulus in the center portion of the slide. The
basement membranes are thickened throughout the
glomerulus. There is no evidence of hypercellularity. This
is the most common cause of nephrotic syndrome in
adults. (Ren082)
22. Membranous glomerulonephritis
This is a silver stain that demonstrates the subepithelial
immunocomplex deposits characteristic of membranous
GN. Note that the spikes are on the epithelial side of the
basement membrane. (Ren055)
23. Electron micrograph of type II
membranoproliferative glomerulonephritis
(nephrotic)
This is also called dense deposit disease owing to the
intramembrane deposition of the immunocomplexes. An
autoantibody against C3 called the C3 nephritic factor
continually activates C3, hence the very low complement
levels in these patients. (Ren274)
24. Diabetic nephropathy (nodular glomerulosclerosis
This slide demonstrates nodular thickening of the
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glomerular mesangium (type IV collagen). There is also
hyalinization of the arteriolar wall of both afferent and
efferent vessels. (Ren275)
25. Renal amyloidosis-Congo red stain
This slide demonstrates the Congo red staining in a case of
amyloidosis which, when polarized under the light
microscope results in an apple green birefringence
pattern. Amyloidosis is a reactive response associated with
underlying diseases such as multiple myeloma, where the
light chains are converted into amyloid. (Ren077)
26. Patient with chronic renal failure and uremic frost
Note the crystals representing urea that are deposited on
the face of this patient. Since the kidneys cannot excrete
urea, the urea is excreted in sweat. (Ren279)
27. Acute tubular necrosis
This is a microscopic photograph of a section of kidney
from a case of acute tubular necrosis demonstrating
collections of necrotic tubules within tubular lumina. These
pigmented renal tubular casts are the classic finding in
acute tubular necrosis. Both forms, ischemic and
nephrotoxic type, produce tubular casts. (Ren010)
28. Acute tubular necrosis
This is another microscopic photograph of a kidney with
acute ischemic tubular necrosis. Note the ghost-like
outlines of many of the tubular cells (coaguation necrosis).
(Ren011)
29. Acute pyelonephritis
This is a gross photograph of a kidney showing scattered
grey-white areas representing collections of acute
inflammatory cells. The pelvis is dilated, which is
consistent with hydronephrosis. The most common
pathogen associated with acute pyelonephritis is E. coli.
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Acute PN is secondary to an ascending infection usually
beginning in the bladder. Vesicoureteral reflux is the most
common cause of acute pyelonephritis. (Ren012)
30. Chronic pyelonephritis
This slide demonstrates scattered eosinophilic protein casts
in the tubular lumina. This process is again due to
obstruction of the tubules. This feature is called
thyroidization of the kidney because the tubules resemble
thyroid acini. (Ren017)
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31. Chronic pyelonephritis
In chronic pyelonephritis, blunt calyces underlie
cortical scars. (Ren294)
32. Papillary necrosis
This slide demonstrates necrosis of the renal papillae.
The causes of this change include analgesic abuse,
sickle cell anemia, acute pyelonephritis and diabetes.
The medullary portion of the kidney is susceptible to
ischemic insult because of the low oxygen tension. Note
the absent papilla in the middle of the kidney. This
produces a ring defect on an IVP. (Ren018)
33. Renal papillary necrosis
Note the necrotic renal papillae. The patient consumed
large quantities of aspirin and acetaminophen for
chronic pain. (Ren070)
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34. Benign nephrosclerosis
This kidney demonstrates the fine granular change of
benign nephrosclerosis, which is the most common renal
disease associated with hypertension. The surface of
the kidney resembles that of a football. Hyaline
arteriosclerosis is the cause of the renal changes in
hypertension. (Ren280)
35. Malignant hypertension
This slide is a gross specimen showing multiple
hemorrhages on the surface of the kidney. This is
called a flea-bitten kidney and is associated with
glomerular damage, glomerulitis, arteriolitis and
hemorrhage in a case of malignant hypertension.
(Ren229)
36. Multiple pale renal infarcts
Note the irregular white areas on the cortical surface.
Most infarcts occur from embolic disease from the left
heart. (Ren285)
37. Renal infarction
Renal infarct with classic coagulation necrosis of
tubules and glomerulus. (Ren286)
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38. Diffuse cortical necrosis
This slide shows coagulation necrosis involving the
cortex of the kidney. This pattern is consistent with
disseminated intravascular coagulation in a patient who
has been pregnant or has developed preeclampsia or
eclampsia in the third trimester. (Ren086)
39. Hydronephrotic kidney
Note the dilated renal pelvis. Urinary stones are the
MCC of hydronephrosis. (Ren287)
40. Staghorn calculus of the kidney
Note the large stone corresponding with the dilated
renal pelvis of the kidney. The stone is composed of
magnesium ammonium phosphate and is due to chronic
urinary tract infections from urease producing organisms
(e.g., Proteus). The urine is alkaline and smells like
ammonia. Triple phosphate crystals are present in the
urine. (Ren284)
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41. Renal cell carcinoma
This slide shows a renal cell carcinoma in the upper pole.
This is a well demarcated cystic and hemorrhagic mass.
Prognosis is related to the extent of involvement of the
renal vein. The tumor has a tendency to metastasize to
the lungs as cannonball metastasis. Renal cell
carcinomas usually manifest in the 6th to 7th decade.
They most commonly present with hematuria. They are
associated with von Hippel-Lindau syndrome. Smoking is
the most common cause of this cancer. (Ren236)
42. Renal cell carcinoma
This slide demonstrates the microscopic findings of a renal
cell carcinoma. The tumor cells derived from the proximal
tubule are clear and vacuolated in appearance. (Ren039)
43. Wilm's tumor
The kidney on the left is almost completely replaced by a
yellow-white mass, representing a Wilm's tumor.
Hypertension (due to renin) and a palpable flank mass are
commonly present. (Ren238)
44. Wilm's tumor
Note the primitive mesenchyme and abortive glomerulus to
the left of the slide. (Ren239)
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45. Hyaline cast
Note the shadowy, acellular cast with round ends
This may be a normal finding (e.g., after a viral illness) or
it may be associated with proteinuria. (Ren254)
46. Maltese cross-nephrotic syndrome
This slide demonstrates a polarized specimen of urine with
a cast filled with free cholesterol, which produces Maltese
crosses. Fatty casts, oval fat bodies and Maltese crosses
are all features of nephrotic syndrome. (Ren043)
47. Red blood cell casts
This slide shows a cast filled with red blood cells. This
finding is classic for a nephritic syndrome where the
patient presents with hypertension, oliguria, red cell casts,
red blood cells, mild to moderate proteinuria, and
periorbital edema. (Ren044)
48. Pigmented tubular cast
A cast such as this is representative of acute tubular
necrosis. The necrotic tubules which have been damaged
either from ischemia or a nephrotoxin are sloughed off and
form a cast. This cast appears in the urine and gives an
appearance of a muddy or dirty urine because of the
necrotic debris. These findings may also be accompanied
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by some red blood cells or white blood cells. (Ren045)
49. White blood cell casts
A white blood cell cast is a typical finding with acute
pyelonephritis and acute drug-induced tubulointerstitial
disease. It may be accompanied by bacteruria, scattered
white blood cells, and occasionally red blood cells. The
white blood cell cast separates cystitis from pyelonephritis.
(Ren046)
50. Fatty casts
This slide shows a refractile cast which if polarized would
have the appearance of the Maltese crosses. Fatty casts
or oval fat bodies are associated with nephrotic syndromes
because a patient typically has hypercholesterolemia.
(Ren047)
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renal6
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Pathology II Images
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Renal
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51. Waxy casts
This slide shows a pale cast with sharp
margins. This represents a waxy cast.
Waxy casts are the end stage of
breakdown of coarse and finally
granular casts and they are classic for
chronic renal failure. (Ren260)
52. Broad cast in chronic renal
failure
The cast is broad owing to tubular
dilatation from obstruction of the
lumens by casts. (Ren261)
53. Calcium oxalate crystals
Calcium oxalate and/or phosphate
crystals are the most common type of
crystal found in the urine. They are
independent of urine pH for formation.
They appear like an unfolded envelope.
They are associated with hypercalcemia
states and commonly accompany
calcium oxalate stones. Additional
causes include Crohn's disease,
excessive intake of vitamin C, and
ethylene glycol poisoning. (Ren050)
54. Triple phosphate crystals
The urine sediment shows scattered
rhomboid shaped crystals that resemble
coffin-lids. These are the crystals of
magnesium ammonium phosphate
which is the substance that forms
struvite or staghorn calculi. The
crystals form in alkaline urine and are
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associated with infections caused by
Protease spp. (Ren051)
55. Uric acid crystals
This slide shows scattered stellate or
star-shaped crystals which are classic
for uric acid crystals. These crystals
form in acid urine. They are seen in
states where there is a high rate of
turnover of cells as in leukemias or
lymphomas or multiple myeloma. They
can also be seen in gout. (Ren206)
56. Cystine crystal
Note the hexagonal shape. It occurs in
the AR disorder called cystinuria and
can be associated with cystine stones.
(Ren263)
57. Hematuria with dysmorphic
RBCs
Note the crenated appearing RBCs.
Dysmorphic RBCs indicate acute
glomerulonephritis. (Ren250)
58. Classic urine sediment in a
lower urinary tract infection
The arrow points to a clump of
neutrophils (+ leukocyte esterase).
Round, slightly red biconcave discs
representing RBCs are present (+
blood). The granular material in the
background represent bacteria (+
nitrite). (Ren251)
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59. Transitional cell carcinoma of
the bladder
This gross specimen has been opened in
lognitudinal plane to show the white
exophytic mass protruding into the
lumen of the bladder. These tumors
are typically found in the trigone of the
bladder and may produce obstruction of
the ureter and hydronephrosis. They
are of transitional cell origin. (Ren053)
60. Transitional cell carcinoma of
the bladder (cytoscopy).
Note the papillary nature of the tumor.
Smoking is the MCC of TCC. (Ren245)
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renal7
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Pathology II Images
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Renal
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61. Nodular hyperplasia of the prostate (paper clip in
urethra)
This slide shows a cross-section through the prostate gland
with multiple nodules which have encroached on the
prostatic urethra. This finding is associated with estrogenenhanced
sensitivity to dihydrotestosterone. The nodular
areas arise in the periurethral areas, which leads to
obstructive uropathy. (Ren057)
62. Nodular hyperplasia of the prostate, hypertrophy of
the bladder, hemorrhagic cystitis
This slide shows the bladder that has been opened with
extension into the prostatic urethra. The bladder mucosa
shows hemorrhage which is consistent with having had an
indwelling catheter. The wall of the bladder is
hypertrophied. The prostate gland shows the nodularity
which is characteristic of nodular hyperplasia. Small
indentations are noted in the bladder mucosa representing
the openings of diverticular sacs which developed from
increased intravesical pressure. (Ren058)
63. Carcinoma of the prostate
This slide shows the cross-section through a prostate gland
with scattered foci of yellow-tan areas which represent the
carcinoma. Carcinoma of the prostate arises in the
posterior lobe and produces a firm or hard prostate gland
on rectal exam. PSA is increased. (Ren059)
64. Carcinoma of the prostate
This slide is a microscopic section of a prostatic
adenocarcinoma showing well-formed glands that are fairly
monotonous in appearance. (Ren060)
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65. Adenocarcinoma of the prostate
This slide shows a nerve with perineural invasion by a
carcinoma of the prostate. Notice the glandular structures
in the area surrounding the nerve. (Ren061)
66. Torsion of the testicle with hemorrhagic infarction
Patients lose the cremasteric reflex. The testicle rides high
in the inguinal canal from vessel torsion. (Ren246)
67. Seminoma
Note the yellow-tan tumor that does not completely replace
the testicle (usually they do, but not in this case).
(Ren298)
68. Seminoma
The microscopic appearance of this tumor shows collections
of germ cells in nests or cords with a stroma that has
scattered lymphocytes present. This is the same histologic
pattern that you would see in a dysgerminoma of the ovary.
(Ren299)
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Gynecology 1
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Pathology II Images
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Gynecology
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1. Herpes genitalis on labia
Note the grouping of the areas of ulceration
on the labia. (Gyn310) 765
2. Herpes genitalis on shaft of penis
Note the ulcers and vesicular lesions.
(Gyn201)
3. Tzanck prep of Herpes genitalis lesion
Note the multinucleated squamous cell and
the dark red intranuclear inclusions
surrounded by a halo. (Gyn309)
4. Herpes genitalis cervicitis
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Note the erosive nature of the inflammation
(Gyn202)
5. Herpes genitalis proctitis
Note the vesiculoulcerative nature of the
lesions (Gyn203)
6. Condyloma acuminata ("venereal
wart") Note the fern-like appearance of the
lesion on the shaft of the penis. It is caused
by HPV 6 or 11. (Derm012)
7. Chlamydia trachomatis urethritis
Note the watery exudate exuding from the
meatus of the penis. Gram stain reveals
neutrophils but no visible organisms (sterile
pyuria). Symptoms occur the second week
after sexual exposure. (Gyn204)
Gynecology 1
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8. Chlamydia trachomatis in cervical Pap
smear
Note the cytoplasmic inclusions with the
vacuoles (lysosomes) and centrally located
elementary bodies. (Gyn308)
9. Chlamydia trachomatis conjunctivitis in
a newborn (ophthalmia neonatorum)
Conjunctivitis is usually bilateral and occurs
during the second week after delivery.
Infection occurs from contamination of the
eyes on passage through an infected
endocervical canal. Chlamydia trachomatis
pneumonia also commonly occurs at the same
time. (Gyn205)
10. Neisseria gonorrhoeae urethritis/
cervicitis
Note the thick exudate from the penis and
surrounding the external os of the cervix.
Symptoms appear within the first week after
sexual exposure. (Gyn206)
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Gynecology 2
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Pathology II Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Gynecology
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11. Neisseria gonorrhoeae gram stain
Note the neutrophil on the right of the screen. It
contains numerous gram negative diplococci. The gram
negative rods are Lactobacilli. (Gyn311)
12. Pelvic inflammatory disease due to Neisseria
gonorrhoeae
Note the inflamed fallopian tubes and enlarged ovaries
(contain abscesses). (Gyn208)
13. Pelvic inflammatory disease due to Neisseria
gonorrhoeae
Note the pus in the lumens of both fallopian tubes and
the multiloculated abscesses in both ovaries. (Gyn307)
14. Fitz-Hughes-Curtis syndrome
Note the adhesions between the parietal peritoneum and
the capsule of the liver. Pus from pelvic inflammatory
disease due to Neisseria gonorrhoeae and/or Chlamydia
trachomatis may produce these adhesions. Patients
complain of chronic pain in the RUQ. (Gyn209)
15. Vulvar lymphedema secondary to
Gynecology 2
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lymphogranuloma venereum
LGV is due to a variant of Chlamydia trachomatis. Unlike
other STDs, this STD has papular lesions (not visible)
rather than ulcers and granulomatous microabscesses in
the inguinal lymph nodes. Obstruction of lymphatics leads
to localized lymphedema. Rectal strictures are also
common in women. (Gyn314)
16. Chancroid (Hemophilus ducreyi)
Note the ulcer on the shaft of the penis. Unlike syphilis,
it is painful. Gram stain demonstrates a school of fish
orientation of the gram negative organisms. (Gyn306)
17. Granuloma inguinale (Calymmatobacterium
granulomatis)
Note the serpiginous ulcers. Unlike other STDs, there is
no lymphadenopathy. (Gyn217)
18. Donovan bodies in macrophages in granuloma
inguinale
Note the phagocytosed organisms. They are very similar
in appearance to Histoplasma yeasts and leishmanial
forms in leishmaniasis. (Gyn312)
Gynecology 2
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19. Clue cell in bacterial vaginosis due to
Gardnerella vaginalis
Note the granular material (adherent bacteria) covering
the surface of the superficial squamous cell. These are
called clue cells. (Gyn304)
20. Dark field of Treponema pallidum
Note the tightly wound spirochete. Dark field is
considered the gold standard for diagnosing syphilis.
(Gyn210)
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Gynecology 4
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Pathology II Images
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Gynecology
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31. Squamous cell carcinoma of the labia
majora
Note the ulcerated lesion on the labia minora. HPV
16 and 18 are the primary causes. (Neo091)
32. Vulvar leukoplakia
Note the white discoloration of the thin epidermis.
This patient has lichen sclerosis (Gyn224)
33. Lichen sclerosis of vulva
Note the thinning of the epidermis and hypocellular
area in the superficial dermis. It is not a precursor
for cancer (Gyn225)
34. Squamous hyperplasia of vulva
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Clinically, this would have looked like leukoplakia.
Note the increased stratum corneum, increased
thickness of the epidermis, and underlying
inflammation. This is a precursor for squamous
cancer. (Gyn226)
35. Vulva with Paget's disease
Note the large cells surrounded by a clear halo in
the epidermis. These are malignant glandular cells
(mucin positive, S100 antigen negative). Paget's is a
cancer limited to the epithelium. (Gyn294)
36. Paget's disease of the vulva
This slide shows large cells with clear appearing
cytoplasm present in the lower portion of the
epidermis. These represent Paget's cells and would
stain positive for mucin. (Gyn016)
37. Paget's disease of the vulva
Notice that there are several nests of large clear
cells present in the owner portion of the epidermis.
These represent Paget's cells. (Gyn017)
38. Gartner's duct cyst
Note the cyst in the lateral wall of the vagina.
Remnant of Wolffian duct (mesonephric duct).
(Gyn227)
Gynecology 4
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39. Rokitansky-Kuster-Hauser syndrome
(Mullerian agenesis)
Note absence of the vagina. The uterus is often
absent as well. The patient has primary amenorrhea
due to an end-organ defect. (Gyn228)
40. Imperforate hymen with blood behind the
membrane (Gyn229)
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Gynecology 5
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Pathology II Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Gynecology
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41. Clear cell carcinoma of the vagina
This lesion is found in the daughters of women who
took DES. Daughters are predisposed to vaginal
adenosis (benign Mullerian epithelium), which is the
precursor for clear cell adenocarcinoma. It occurs in
the age group of 17-22 and occurs on the anterior
wall of the upper third of the vagina where
Mullerian epithelium joins with the urogenital sinus.
Notice that the tumor forms glandular structures on
the left or sheets of clear staining cells on the right.
(Gyn022)
42. Embryonal rhabdomyosarcoma
This slide shows a classic feature of the embryonal
rhabdomyosarcoma (skeletal muscle sarcoma),
mainly cross striations. (Neo205)
43. Cervical pap smear with endocervical cells
Note the glandular appearing endocervical cells on
your left. These indicate that there is adequate
sampling of the transformation zone, the primary
site for squamous dysplasia and cancer. (Gyn231)
44. Cervical pap smear with superficial
squamous cells
Note the eosinophilic cytoplasm (may be blue) and
pyknotic nucleus. These cells indicate estrogen
stimulation. (Gyn315)
Gynecology 5
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45. Cervical pap smear with intermediate
squamous cells
Note the blue cytoplasm (may be eosinophilic) and
less dense appearing nuclei. These indicate
progesterone stimulation. (Gyn316)
46. Cervical pap smear with parabasal cells:
parabasal cells indicate the absence of estrogen and
progesterone stimulation. (Gyn317)
47. Nabothian cysts
Nabothian cysts arise in endocervical glands where
the gland duct has been blocked by squamous
epithelium that has replaced endocervical
epithelium. Nabothian cysts are a feature of chronic
cervicitis. (Gyn038)
48. Carcinoma-in-situ (CIN III) of the cervix
Note the full thickness dysplasia of the epidermis
and lack of surface maturation. HPV 16 or 18 are
the MC causative agent. (Neo093)
49. Koilocytosis of cervix
Note the squamous cells with the pyknotic nuclei
surrounded by a clear space (called koilocytosis).
These cells have been infected by HPV. (Gyn318)
50. Cervical dysplasia mosaic pattern
This pattern is associated with dysplasia of the
cervix. It is produced when acetic acid is applied to
Gynecology 5
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the surface of the cervix. This application
coagulates the proteins of the nucleus and
cytoplasm of the cervical cells and makes the
proteins opaque and white. The term referring to
this change is called acetowhite epithelium. The
mosaic pattern is caused by terminal capillaries
surrounding roughly circular or polygonal shaped
blocks of acetowhite epithelium crowded together
which causes the mosaic pattern similar to mosaic
tile. The vessels form a basket around the blocks of
abnormal epithelium. (Gyn047)
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Gynecology 6
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Pathology II Images
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Gynecology
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51. Invasive cervical squamous carcinoma
The rectal vault is to your left. A portion of distal
vagina and ulcerated cervix, representing squamous
cancer, is in the middle. The urinary bladder is on
your right. Note the white appearing cancer
extending through the wall of the cervix into the wall
of the subjacent urinary bladder. Although not
visible, the ureterovesical junction is in this area and
is most likely blocked by the cancer. This explains
why renal failure is the MC cause of death.
(Gyn319)
52. Endometrial cycle
This slide shows the early proliferative phase which is
evidenced as elongation of the endometrial glands.
The cells lining the glands show scattered mitotic
figures. There is no obvious stratification at this
time. (Gyn051)
53. Endometrial cycle
This slide shows a gland that is representative of a
later stage of the proliferative phase. The nuclei
within the gland demonstrate stratification and there
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are scattered mitotic figures present. (Gyn052)
54. Endometrium-ovulation
The presence of subnuclear vacuoles is consistent
with the ovulatory phase of the cycle. The secretory
products will then progress toward the lumen as the
glands enter the secretory phase. The subnuclear
vacuoles typically appear around cycle day 16.
(Gyn053)
55. Early secretory phase-endometrium
This slide demonstrates several vacuoles which are
on the luminal side of the glands. This is consistent
with the migration of the vacuole toward the lumen.
This usually occurs by cycle day 19-20. (Gyn054)
56. Secretory phase-endometrium
This slide demonstrates a slightly later stage of the
secretory phase in the previous slide. Notice the
marked vacuolization projecting toward the lumen
and the presence of secretory material within the
lumen of the glands. (Gyn055)
Gynecology 6
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57. Late secretory phase of the menstrual cycle
Note the prominent tortuosity of the glands.
(Gyn242)
58. Decidualized stroma
Decidualization of stromal cells is a sign of
pregnancy. (Gyn243)
59. Arias-Stella phenomenon
An exaggerated secretory phase as evident in this
slide is a sign of pregnancy. (Gyn244)
60. Endometrial mucosa in a patient on birth
control pills
Note the atrophy of the endometrial glands
(progesterone effect) and prominent
pseudodecidualized stroma. (Gyn246)
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Gynecology 7
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Pathology II Images
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Gynecology
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61. Hirsutism
Note the increase in hair in normal hair bearing
areas. Virilization is hirsutism + signs of male
secondary sex characteristics (e.g., clitoromegaly).
(Gyn320)
62. Ovary with subcortical cysts in polycystic
ovarian syndrome
Note the cysts that are devoid of follicles. Constant
suppression of FSH causes the follicles to
degenerate. (Gyn321)
63. Turner's syndrome
Patient is XO. Note the poor female secondary sex
characteristics and prominent webbed neck.
(Gyn248)
64. Intrauterine device (Gyn249)
Gynecology 7
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65. Chronic endometritis
Both of the microscopic sections represented on this
slide show sulfur granules associated with
Actinomyces israelii. This organism is associated
with the presence of an IUD. The diagnosis of
endometritis of the chronic type is based on finding
plasma cells in the stroma. The sulfur granules
represent tangles of organisms which are
filamentous. (Gyn060)
66. Endometrial polyp
The vagina is at the top and uterus on the bottom.
A polyp is noted in the lumen of the uterus. Polyps
are not precursors for cancer, however, they are a
common cause of bleeding. (Gyn251)
67. Simple hyperplasia of endometrial mucosa
Note the enlarged gland with secretions in the
center. (Gyn257)
68. Complex hyperplasia of endometrial mucosa
Note the glandular crowding with outpouching of
glandular lumens. It is a precursor for
Gynecology 7
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adenocarcinoma. (Ci048A)
69. Uterus with adenomyosis
Note the enlarged uterus with coarse trabeculation
of the myometrial tissue. (Gyn254)
70. Adenomyosis
This slide shows the presence of endometrial glands
and stroma within the wall of the uterus and not
connected to the overlying endometrium. It is not
endometriosis, since endometriosis is the presence
of functioning glands and stroma outside the
confines of the uterus. (Gyn062)
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Gynecology 8
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Pathology II Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Gynecology
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71. Bilateral hemorrhagic cysts of the ovaries
associated with endometriosis. (Gyn255)
72. Endometrial adenocarcinoma
The rectal ampulla is to your right (note the pouch of
Douglas between the rectum and posterior wall of the
uterus). The entire vagina, cervix, and uterus is in the
middle. The bladder is on your left. Note the fungating
cancer in the top portion of the body of the uterus. The
tumor extends through the wall and out to the serosa.
(Neo095)
73. Endometrial adenocarcinoma
Note the crowding of the neoplastic glands and necrotic
debris in the gland lumens. (Neo096)
74. Leiomyomas of the uterus
Note the white swirling masses in the body of the fundus.
An invasive cervical squamous cancer is present in the
underlying cervix (white material). (Neo094)
75. Leiomyomas of the uterus
Gynecology 8
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Note the large pedunculated leiomyoma originating from
the serosa. They do not predispose to leiomyosarcoma.
(Gyn252)
76. Leiomyosarcoma
Note the anaplastic appearing nuclei. The mitosis count is
the key to diagnosing these sarcomas. (Neo097)
77. Ruptured ectopic pregnancy
Note the embryo within the blood clot. (Gyn322)
78. Follicular cyst of the ovary
These commonly rupture and produce localized sterile
peritonitis. They are the MC ovarian mass in young
women. (Gyn323)
79. Serous cystadenocarcinoma
This slide shows a large cystic structure with solid areas.
The presence of the solid tissue is consistent with the
malignant form of serous tumor. Microscopic exam would
show ciliated epithelium. This is the most common
primary malignant ovarian tumor. Sixty-six percent
of the cases are bilateral. The marker for this tumor is
CA125. It is one of the tumors of the ovary that calcify.
The calcified structures are called psammoma bodies.
(Gyn099)
80. Serous cystadenocarcinoma
This is an additional section of the serous malignant
tumor showing the papillary structures and psammoma
bodies (apoptotic tumor cells with dystrophic
Gynecology 8
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calcification). (Gyn101)
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Gynecology 9
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Pathology II Images
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Gynecology
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81. Brenner's tumor with a Walthard's rest
These are benign tumors derived from surface
epithelium. They are commonly associated with benign
mucinous cystadenomas. The epithelium of a Walthard
rest has a transitional cell appearance. (Gyn265)
82. Mucinous cystadenocarcinoma
This slide is a gross specimen of a mucinous tumor
which has been opened showing solid areas and cystic
areas. Presence of solid areas is characteristic of the
malignant variant of the cystadenocarcinoma. These
tumors commonly seed the omentum and produce
pseudomyxoma peritoneii. They are the largest of all
ovarian tumors. (Gyn112)
83. Cystic teratoma (mature teratoma)
This slide is a gross specimen of a tumor that
demonstrates severeal characteristics of the benign
teratoma. This tumor is derived from all 3 germ cell
layers, but the ectodermal component is the most
commonly represented or is the component that is the
most dominant as far as appearance of the tumor.
Notice that there is hair protruding from the tumor.
There are also tooth-like structures present. This tumor
is the most common germ cell tumor and the mature
variant or cystic variant is benign. It is also called a
dermoid cyst. This tumor originates from a single germ
cell after its first meiotic division. The tumor occurs in
young women in the 20-40 year age range.
Occasionally it can contain a malignant component and
that would be most typically a squamous cell carcinoma.
(Gyn124)
84. Cystic teratoma, benign
This specimen shows a large ovarian mass attached to
the uterus which you can appreciate on the left side of
the slide. The tumor has been opened and shows a
keratin-like material filling the cyst. There is quite a lot
Gynecology 9
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of hair also associated with the tumor. (Gyn125)
85. Histologic section of a cystic teratoma (germ
cell tumor)
Note the squamous epithelium, sebaceous glands, and
cartilage. (Gyn268)
86. Dysgerminoma
This shows large cells surrounded by stroma with a
lymphocytic infiltrate. These malignant germ cell
tumors are the female counterpart of seminomas in
males. They are associated with Turner's syndrome.
(Gyn134)
87. Ovarian fibromas
Note the bilateral nodular masses in both ovaries. These
are the MC stromal tumor of the ovary and are benign.
Fibromas are not typically hormone-producing unless
they contain thecal cells. This patient may have had
Meigs syndrome which refers to the presence of a
right-sided pleural effusion, an ovarian fibroma, and
ascites. (Gyn146)
88. Granulosa theca cell tumor
This is a microscopic appearance of the granulosa/thecal
cell tumor. The nests of cells resemble the follicle of
the ovary. The clear spaces are called Call-Exner bodies,
which are a diagnostic feature of the granulosa cell
tumor. These tumors are the MC tumor to secrete
estrogen. (Gyn141)
89. Hilar cell tumors (steroid cell tumors). These
tumors are benign and secrete androgens. They are
Gynecology 9
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unilateral. A characteristic feature is the elongated
eosinophilic rod-like crystal which is called a Reinke
crystalloid. (Gyn274)
90. Metastatic adenocarcinoma to ovary
This slide shows mucin-positive signet ring cells which is
called a Krukenberg tumor. It is most commonly a
mucin producing adenocarcinoma from the stomach
which metastasizes to both ovaries. (Gyn275)
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Gynecology 10
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Pathology II Images
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Gynecology
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91. Normal chorionic villus
The surface is lined by trophoblastic tissue
(syncytiotrophoblast on the outside and cytotrophoblast
underneath). Note the myxomatous stroma and small
vessels with nucleated RBCs. These vessels coalesce to
form 2 umbilical veins, which carry the greatest
concentration of oxygen. (Gyn324)
92. Abruptio placenta
This slide shows multiple sections through placenta with a
retroplacental clot. Abruptio placenta will present with
painful vaginal bleeding and it represents a premature
separation of the placenta producing a retroplacental
clot. It's a complication of pre-eclampsia and any cause
of hypertension. It is associated with cocaine addiction.
(Gyn154)
93. Abruptio placenta
This is an additional specimen showing a placenta with
retroplacental clot. Notice the umbilical cord in the
central portion of the specimen. When hematomas form
involving a third or more of the maternal surface of the
placenta, this can result in fetal demise. There is a 30
to 65% mortality rate of the fetus associated with
abruptio placenta. Recall that this is a complication of
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pre-eclampsia, hypertension, and cocaine addiction.
(Gyn155)
94. Placenta accreta
Note the chorionic villi on the left of the histologic
section directly implanting on myometrial tissue without
any intervening decidua. The uterus must be removed
(gross specimen) or the patient will bleed to death.
(Gyn279)
95. Accessory lobe and velamentous insertion of the
umbilical cord along the margin of the placenta
Both pose a risk for hemorrhage. (Gyn281)
96. Hydatidiform (complete) mole
Note the grape like masses representing neoplastic
chorionic villi lined by trophoblastic tissue. They present
as preeclampsia in the first trimester and a uterus
too large for gestational age. Ultrasound demonstrates
a "snowstorm" effect. They may progress into a
choriocarcinoma if not adequately removed. (Neo105)
97. Choriocarcinoma
This slide illustrates the two populations of cells
composing a choriocarcinoma. You notice that the
central portion of the nests contain cells with clear
vacuolated looking nuclei. Surrounding these little
chords or nests of cells are the syncytotrophoblasts
(hormone producing cells) which are groups of nuclei
within a large mass of cytoplasm. The cells in the central
portion are the cytotrophoblasts. (Gyn162)
98. Fibrocystic change
Note the large cyst surrounded by a fibrous stroma within
which are smaller bluish-discolored cysts. FCC is the
Gynecology 10
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MCC of a breast mass in women under 50 years old.
(Gyn325)
99. Fibroadenoma
This is a microscopic appearance of a fibroadenoma
showing the slit-like duct spaces surrounded by stroma.
It is a well circumscribed tumor. Fibroadenoma is the
most common benign breast tumor and it occurs in
women younger than age 35. It most commonly
occurs in the left upper quadrant of the breast and
presents as a firm rubbery painless well-circumscribed
mass. It is due to an increased sensitivity to estrogen.
(Gyn178)
100. Carcinoma of the breast
This patient has been asked to raise her arms. Note the
retraction of the skin in the left lower quadrant
associated with an underlying invasive ductal carcinoma.
(Gyn192)
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Gynecology 11
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Pathology II Images
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101. Infiltrating ductal carcinoma
The infiltrating ductal carcinoma is the most
common type of breast cancer. Grossly, it appears as
a stellate area of firm tissue which is described as being
stony hard. Another name applied to this tumor is a
scirrhous carcinoma. The fixed nature of the tumor is
due to desmoplastic response as the individual tumor
cells invade surrounding tissues. This causes fixation to
overlying structures as the skin and the dimpling affect
or retraction that is noted with infiltrative cancers.
(Gyn195)
102. Infiltrating ductal carcinoma
This is another gross specimen demonstrating a stellateappearing
firm nodule. (Gyn196)
103. Gross of infiltrating ductal cancer
Note the stellate appearance of the indurated mass.
(Gyn286)
104. Infiltrating ductal carcinoma
This slide is quite classic for the typical pattern of an
infiltrating ductal cancer. Notice that the tumor cells
are in next and cords and they are infiltrating through
the surrounding tissue. There is an intense
desmoplastic response to this infiltration which gives the
name scirrhous carcinoma to this type of invasive
cancer of the breast. (Gyn197)
Gynecology 11
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105. Cribriform (sieve-like) pattern of ductal
carcinoma in-situ (DCIS) (Gyn287)
106. Comedocarcinoma variant of DCIS
Note the necrotic centers of the ducts surrounded by
malignant ductal cells. (Gyn288)
107. Infiltrating ductal carcinoma with vessel
invasion
Note the vessel in the middle of the slide has a plug of
tumor. Nests of malignant cells are infiltrating the
stroma around the vessel. (Gyn289)
108. Mammogram showing densities in both
breasts
A fine needle aspiration is necessary to determine
whether these lesions are benign or malignant.
(Gyn284)
109. Paget's disease of breast
Notice that the nipple surrounded by an eczematoid
rash. This characteristic is associated with Paget's
disease, which is a ductal carcinoma that is infiltrating
the epithelium of the nipple and areola. Microscopic
appearance would show clear cells in the epidermis,
similar to those noted in extramammary Pagets of the
vulva. (Gyn1904)
110. Paget's disease of the breast
Note the eczematous appearing rash and nipple
inversion on the left. (Gyn290)
Gynecology 11
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Gynecology 12
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Pathology II Images
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Gynecology
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111. Paget's disease of the breast
Note retraction of the bottom portion of the nipple. The
tip of the nipple has an abnormal discoloration, probably
representing malignant cells infiltrating the epidermis.
(Gyn291)
112. Carcinoma of the breast peau d' orange.
Notice the dimpling of the skin having the appearance of
an orange. This is due to obstruction of subcutaneous
lymphatics causing localize lymphedema. (Gyn193)
113. Peau d'orange appearance of inflammatory
carcinoma of the breast
Note the enlarged erythematous right breast with the
dimpling effect on the surface. (Gyn295)
114. Lobular carcinoma in-situ
Note the terminal acini filled with monomorphic
appearing cells. This neoplasm has the greatest
incidence of bilaterality. (Gyn297)
115. Infiltrating lobular carcinoma
Gynecology 12
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In the middle of the slide you see individual tumor cells
that are lined up behind one another infiltrating through
the tissue. This is called the Indian file pattern of
infiltration of an invasive lobular carcinoma. (Gyn298)
116. Cystosarcoma phyllodes or phyllodes tumor
This is a gross specimen showing in a massively
enlarged left breast which has been replaced by large,
bulky tumor tissue. Most patients who develop this
lesion are older than 40. This tumor has benign
glandular tissue and a malignant stroma. It resembles
the fibroadenomas but the stromal elements tend to be
more hypercellular. It is best to view this tumor as
having a low grade malignant potential. (Gyn185)
117. Lymphedema following radical mastectomy
This slide demonstrates extensive lymph stasis in the
right arm in a patient who had a radical mastectomy.
This treatment removes all of the pectoralis major and
minor and the axillary lymph node chain which renders
the dependent extremity enable to drain lymphatic
fluid. The patients are susceptible to having extensive
swelling of that dependent extremity, and the potential
for lymphangiosarcoma. (Gyn1909)
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Dermatology 1
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Pathology II Images
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Dermatology
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1. Acute eczema:
Note weeping appearance of the skin surface (Drm001)
2. Chronic eczema:
Note the dry, hyperkeratotic skin from constant
scratching (Drm002)
3. Atopic dermatitis in child:
Family history of IgE-mediated disease is common
(Drm003)
4. Contact dermatitis to nickel:
Note the eczematous rash; this is type IV
hypersensitivity (Drm004)
Dermatology 1
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5. Seborrheic dermatitis (dandruff):
This is due to M. furfur (Drm005)
6. Tinea capitis with a positive Wood's lamp:
Microsporum canis infects the outer part of the hair
shaft, hence the fluorescence. T. tonsurans is the most
common cause of tinea capitis and does not fluoresce
(Drm006)
7. Tinea corporis ("ringworm"):
Note the outer red border and clear center. T. rubrum is
the most common cause. (Drm007)
8. KOH preparation of above lesion:
Note the hyphae and yeast forms (Drm008)
Dermatology 1
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9. Tinea versicolor:
Note the areas of pigmentation and depigmentation. It
is due to M. furfur. (Drm009)
10. KOH of tinea versicolor:
Note the "sphagetti and meatball" appearance of the
hyphae and yeasts of M. furfur. (Drm010)
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Dermatology 2
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Pathology II Images
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11. Pap smear of Candida albicans:
Note the pseudohyphae and yeasts. The thread-like
bacteria are called Leptothrix (Drm011)
12. Condyloma acuminata:
Note the fern-like appearance. It is due to HPV types 6
or 11 (Drm012)
13. Molluscum contagiosum:
Note the crateriform lesion with a central area of
umbilication (Drm013)
14. Child with rubeola (regular measles):
Note the diffuse maculopapular rash and runny nose
(Drm014)
Dermatology 2
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15. Coated tongue of a child with scarlet fever:
The white material will slough off and produce the
classic strawberry tongue. This is a group A
streptococcal infection. (Drm015)
16. Actinic (solar) keratosis:
Note the pearly gray, hyperkeratotic lesion. It is a
precursor for squamous cell carcinoma (Drm016)
17. Actinic (solar) keratosis:
Note the hyperkeratosis corresponding with the pearly
gray appearance of the above lesion. Also note the
dysplastic squamous epithelium and purplish
discoloration of the elastic tissue in the dermis. This is
called solar elastosis. (Drm017)
18. Wickham's stria in a patient with lichen planus:
Dermatology 2
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Note the lacy-white lesion on the buccal mucosa.
(Drm018)
19. Psoriasis:
Note the raised red plaque with silvery scales on the
surface. Pinpoint bleeding will occur if the scale is
picked off (Auspitz sign). (Drm019)
20. Nail pitting in a patient with psoriasis
(Drm020)
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Dermatology 3
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Pathology II Images
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21. Histologic section of psoriasis:
Note the hyperkeratotic surface, which corresponds to
the silvery scales on the skin in the lesion above. There
is acanthosis and accentuation of rete ridges into the
dermis. Note how close the superficial dermis comes to
the surface of the scale. Can you picture scraping the
scale off and pinpoint bleeding from blood vessels in the
superficial dermis? (Drm021)
22. Oval herald patch in pityriasis rosea:
the lesion looks like tinea corporis but is not infectious
(Drm022)
23. "Christmas tree" distribution of the rash of
pityriasis rosea (Drm023)
24. Child with Herpes simplex lesions (Drm024)
Dermatology 3
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25. Varicella (chickenpox):
Note the vesicular and macular lesions at different
stages of development (Drm025)
26. Herpes zoster (shingles):
Note the dermatome distribution of the vesicular rash
that has crusted over (Drm026)
27. Impetigo:
Note the honey-crusted lesions on the face. Group A
streptococcus is most often responsible for the infection.
(Drm027)
28. Bullous pemphigoid:
Note the bullous lesion on the skin surface. It is an
autoimmune skin disease. (Drm028)
29. Erythema multiforme:
Note the "target cells of the skin". (Drm029)
Dermatology 3
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30. Breast abscess due to Staphylococcus aureus
(Drm030)
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Dermatology 4
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Pathology II Images
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31. Acne vulgaris (Drm031)
32. Acne rosacea:
Note the pustular appearance of the lesion (Drm032)
33. Urticaria with dermatographism:
Note the wheals (hives) in the upper slide and the
ability to write on the skin surface due to the release of
histamine from underlying mast cells in the skin.
(Drm033)
Dermatology 4
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34. Hereditary angioedema (C1 esterase inhibitor
deficiency):
Note the swelling of the face due to the release of
anaphylatoxins into the skin with subsequent
angioedema (Drm034)
35. Cellulitis with lymphangitis extending up the
arm post-brown recluse spider bite (Drm035)
36. Erysipelas secondary to group A streptococcus
(Drm036)
37. Butterfly rash of SLE (Drm037)
Dermatology 4
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38. Lymphocutaneous nodules of sporotrichosis:
Note the puncture wound at the base of the second
finger (Drm038)
39. Patient with lepromatous leprosy (Drm039)
40. Keratoacanthoma over the eye:
Note the cutaneous horn extending from the crater. This
lesion is very often confused with squamous carcinoma.
(Drm040)
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Dermatology 4
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Dermatology 5
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Pathology II Images
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41. Erythema nodosum:
Note the red nodular lesions on the anterior surface of
the lower legs. These commonly occur with
coccidioidomycosis and histoplasmosis. (Drm041)
42. Basal cell carcinoma:
Note the crateriform shape of the tumor and the
ulcerated surface. The walls of the crater are
erythematous from dilated blood vessels. (Drm042)
43. Basal cell carcinoma:
Note the multifocal areas of basophilic staining cells
extending from the basal cell layer invading into the
dermis. (Drm043)
44. Vitiligo:
Note the depigmented area where there has been
autoimmune destruction of melanocytes (Drm044)
Dermatology 5
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45. Seborrheic keratosis:
Note the "stuck on" appearance of this verrucoid
appearing, pigmented lesion. The Leser-Trelat sign
refers to a sudden outcropping of these lesions in
patients with stomach adenocarcinoma. (Drm045)
46. Acanthosis nigricans:
Note the pigmented lesion in the axilla. It is a
phenotypic marker for stomach cancer (Drm046)
47. Junctional nevus in a child (Drm047)
48. Superficial malignant melanoma and nodular
melanoma (Drm048)
49. Lentigo malignant melanoma (Drm049)
Dermatology 5
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50. Acral lentiginous malignant melanoma under
the nail (Drm050)
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Endocrine 1
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Pathology II Images
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Endocrine
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1. Skull x-ray with enlarged sella turcica due to a
nonfunctioning pituitary adenoma:
The anterior and posterior clinoid processes are worn
away by the expanding tumor. This is the MCC of
hypopituitarism in adults. (End001)
2. Coagulation necrosis of anterior pituitary gland in
a woman with Sheehan's postpartum necrosis:
Note the vague outline of what used to be living tissue.
Cessation of lactation is the first symptom, owing to the
hyperplasia of prolactin secreting cells that occurs during
pregnancy. Other signs of hypopituarism usually follow
over the ensuring months. (End002)
3. Gross of craniopharyngioma in a child:
Note cyst spaces and hemorrhage. Calcifications are
commonly noted on x-rays. This is the MCC of
hypopituitarism in children. They derive from Rathke's
pouch remnants. (End003)
4. 10 years before and after in a patient with
acromegaly:
Note the thick lips and coarse features. (End004)
Endocrine 1
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5. Normal hand on your left and large hands of
acromegalic:
Lateral bone growth occurs and an increase in soft tissue
related to IGF-1. (End202)
6. Patient with a lingual thyroid gland at the base of
the tongue:
The thyroid tissue did not migrate into the neck but
stayed at the foramen cecum. (End006)
7. Thyroid scan on same patient showing uptake of
the dye only at the base of the tongue:
In most cases, all the thyroid tissue is located in the
lingual thyroid, hence ablation of the tissue leads to
hypothyroidism. (End007)
8. Midline thyroglossal duct cyst:
They frequently descend through the hyoid bone, which
must also be removed at surgery to remove all remnants
of the cyst and foci of thyroid tissue. (End008)
Endocrine 1
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9. Anterolateral branchial cleft cyst (End009)
10. Man with primary hypothyroidism:
Note periorbital puffiness related to GAG deposition in
the periorbital tissue. (End010)
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Endocrine 2
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Pathology II Images
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Endocrine
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11. Woman with far advanced primary
hypothyroidism (End011)
12. Microscopic of Hashimoto's thyroiditis:
Note the germinal follicle and total destruction of thyroid
parenchyma. Anti-microsomal antibodies attack the cells
and destroy them. An inhibitory IgG- thyroid stimulating
immunoglobulin along with gland destruction produces
hypothyroidism. (End012)
13. Woman with Graves' disease:
Note exophthalmos, thyromegaly, pretibial myxedema
(End013)
14. Woman with Graves' disease:
Note exophthalmos (End014)
Endocrine 2
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15. Woman with Graves' disease:
Note the diffuse thyromegaly. There may be some
evidence of lid stare, since the white's of her eye appear
apparent. (End015)
16. Man with severe ("malignant") exophthalmos:
Note the conjunctival redness and upward gaze of the
eye related to ophthalmoplegia and the deposition of
GAGS into the eye muscles and periorbital fat.
(End016)
17. Elderly woman with Grave's disease manifesting
as apathetic hyperthyroidism:
Patient had atrial fibrillation. Heart disease and
arrhythmias are the MC findings in apathetic
hyperthyroidism. (End017)
Endocrine 2
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18. Pretibial myxedema in a patient with Graves'
disease:
Due to GAG deposition in subcutaneous tissue. It is nonpitting.
(End018)
19. Separation of distal nail in patient with Graves'
disease:
Called thyroid acropachy. Like exophthalmos and
pretibial myxedema, acropachy is unique to Grave's
disease. (End019)
20. Gross of a multinodular goiter with hemorrhage
into cysts:
Hemorrhage into a cyst causes sudden, painful
enlargement of the gland. (Hem020)
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Endocrine 3
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Pathology II Images
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Endocrine
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21. Patient with a large endemic goiter due to iodide
deficiency. (End021)
22. Gross of a benign follicular adenoma:
It usually presents as a non-functional, "cold nodule".
(End022)
23. Microscopic of papillary carcinoma of thyroid:
Note the psammoma bodies, with represent dystrophic
calcification of neoplastic cells that have undergone
apoptosis. (End023)
24. Papillary carcinoma metastatic to a cervical
lymph node. (End024)
Endocrine 3
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25. Follicular carcinoma invading a blood vessel:
Follicular cancers avoid the lymphatics, unlike papillary
cancer. (End025)
26. Medullary carcinoma of thyroid:
Pink material is amyloid derived from calcitonin.
Calcitonin is the tumor marker for medullary carcinoma.
Most cases are sporadic rather than familial. If this was
familial, then it had to be either a MEN IIa or IIb
syndrome. (End026)
27. Polarization of amyloid in the above cancer after
a Congo stain:
Note apple green birefringence, similar to a Granny
Smith apple. (End027)
28. Microscopic of a parathyroid adenoma composed
of chief cells:
Note the atrophic parathyroid tissue outside the
adenoma. It is atrophic because the suppression of TSH
by hypercalcemia causes normal thyroid tissue to
undergo atrophy. (End028)
29. Microscopic appearance of a second parathyroid
Endocrine 3
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gland in the above patient: Note the increase in fatty
tissue, indicating that the gland has been suppressed
(hypercalcemia suppresses normal glands PTH
production) and is atrophic (End029)
30. Patient with primary hyperparathyroidism:
Note metastatic calcification in the outside rim of the
cornea (End030)
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Endocrine 4
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Pathology II Images
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Endocrine
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31. Bone x-rays in a patient with primary
hyperparathyroidism:
Note resorption of bone of the distal phalanges. Also
note the cystic mass in the proximal humerus
representing osteitis fibrosa cystica, a late bone finding
in primary HPTH. These cysts are more commonly
located in the jaw. (End031)
32. Skull x-ray in a patient with primary
hyperparathyroidism:
Note the "salt and pepper" appearance of the bone is
related to bone resorption. (End032)
33. Patient with carpopedal spasm due to tetany:
This is called Trousseau's sign. If the total calcium was
normal, then alkalosis probably was responsible. If the
total calcium was decreased, then hypoparathyroidism
had to be responsible. (End033)
Endocrine 4
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34. Gross of a functioning adrenal cortical adenoma
(adrenal Cushing's):
Note the atrophy of the residual adrenal gland. This is
another example of suppression of normal gland tissue in
hyperfunctioning adenoma. In this case, cortisol
suppressed pituitary ACTH, which caused normal adrenal
cortex fasciculata and reticularis to undergo atrophy.
(End034)
35. Man with pituitary Cushing's before (your left)
and after surgery (your right) (End035)
36. Woman with pituitary Cushing's before (your
left) and after surgery (your right) (End036)
37. Woman with Cushing's and purple stria:
Also note the large ecchymoses on the upper arm. This
is due to vessel instability from excess cortisol
weakening collagen. This woman does not demonstrate
the thin extremities often seen in Cushing's. (End037)
Endocrine 4
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38. Gross of a pheochromocytoma:
Note the brown discoloration (called a chromaffin tumor)
and cystic spaces, most likely related to hemorrhagic
necrosis. The majority are benign and unilateral.
(End038)
39. Microscopic of a neuroblastoma:
Note small, hyperchromatic cells (they stain positive for
S100 antigen, indicating neural crest origin). Also note
the Homer-Wright rosettes (pink material surrounded by
small blue cells). (End039)
40. Hyperpigmentation of the buccal mucosa in a
patient with Addison's disease (End040)
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Endocrine 5
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Pathology II Images
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Endocrine
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41. Hyperpigmentation of the gums in a patient with
Addison's disease (End041)
42. Hyperpigmentation of the flexor creases in the
hands in a patient with Addison's disease (End042)
43. Hemorrhage into the adrenal glands in a patient
with Waterhouse-Friderichsen's syndrome due to
Neisseria meningitidis:
The hemorrhagic infarction of the glands is due to DIC.
(End043)
44. Snow flake cataract in a patient with diabetes
mellitus:
Due to osmotic damage (End044)
Endocrine 5
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45. Microscopic of a glomerulus in a patient with
diabetes mellitus (nodular glomerulosclerosis):
Note the hyaline arteriolosclerosis of the afferent/efferent
arterioles (due to non-enzymatic glycosylation)
(End045)
46. Retina in a diabetic showing microaneurysms
(red dots):
Due to osmotic damage of pericytes (End274)
47. Retina in a diabetic showing neovascularization
(arrows, proliferative retinopathy).
Ophthalmologists use various dyes to demonstrate
microaneurysms better so they can be lasered.
(End047)
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Musculoskeletal 1
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Pathology I Images
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Musculoskeletal
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1. Synovial fluid tubes:
From left to right, #1 normal, #2 noninflammatory (e.g.,
osteoarthritis), #3 inflammatory (e.g., rheumatoid
arthritis), #4 septic (e.g., gonococcal septic arthritis), #5
hemorrhage (e.g., trauma, hemophilia A) (MS001)
2. Synovial fluid crystals with red filter in place
(1) Crystals are monoclinic (needle shaped) and could be
either monosodium urate or calcium pyrophosphate, (2) if
crystal is yellow when parallel to the slow ray of the
compensator, it is monosodium urate and defines
negative birefringence, (3) if crystal is blue when parallel
to the slow ray of the compensator, it calcium
pyrophosphate and defines positive birefringence
(MS002)
3. Synovial fluid crystal
Triclinic (rhomboid shaped) crystal is always calcium
pyrophosphate, note that it is blue when parallel to the
slow ray of the compensator (black arrow) (MS003)
4. Osteoarthritis
Blue stains cartilage and red bone, note how the articular
cartilage is worn down and fibrillated in areas
(perpendicular cracks), note the osteophyte at the margin
of the joint (MS004)
Musculoskeletal 1
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5. Osteoarthritis
X-ray of head of femur removed at surgery, note the
subchondral bone cysts beneath the surface (MS005)
6. Osteoarthritis
Note the enlargement of the DIP (Heberden's nodes) and
PIP joints (Bouchard's nodes), enlargements represent
osteophytes (MS006)
7. Osteoarthritis
Note x-ray of hands and OA in the DIP and PIP joints,
note the narrow joint space in the femoral joint and
sclerotic changes (MS007)
8. Charcot (neuropathic) joint
Note enlarged knee on your right (patient left knee)
(MS008)
9. Rheumatoid arthritis (RA)
note the enlarged MCP joints (MS009)
Musculoskeletal 1
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10. RA
Note symmetrical involvement in both hands with
enlarged MCP joints and ulnar deviation (MS010)
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Musculoskeletal 2
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Pathology I Images
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Musculoskeletal
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11. RA
Boutonniere deformity of digit - note extension of DIP
joint and flexion of PIP joint (MS011)
12. RA
Swan-neck deformity of digit - note flexion of DIP joint
and extension of PIP joint (MS012)
13. RA
Rheumatoid nodules on extensor surface of forearm,
example of fibrinoid necrosis (same lesions seen in acute
rheumatic fever) (MS013)
14. Gout
Note inflamed first metatarsophalangeal joint (big toe)
(MS014)
15. Gout
Note large tophus on malleolus and along margin of the
foot, sign of chronic gout, composed of crystalline
Musculoskeletal 2
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material (H and E shows multinucleated giant cell
reaction to the MSU crystals) (MS015)
16. Gout
Polarization of tophus showing MSU crystals (MS016)
17. Gout
X-ray of digit showing erosive joint disease in bottom
digit (MS017)
18. Chondrocalcinosis
Note the linear density in the articular cartilage
representing pseudogout crystal deposition (MS018)
19. Synovial fluid
neutrophil with phagocytosed triclinic crystal representing
calcium pyrophosphate (MS019)
Musculoskeletal 2
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20. Ankylosing spondylitis (AS)
Note anterior flexion which often results in restrictive
lung disease (MS020)
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Musculoskeletal 3
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Pathology I Images
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Musculoskeletal
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21. AS
Note sclerotic change in both sacroiliac joints in left
screen and fused vertebral column (bamboo spine) in
right screen (MS021)
22. Reiter's syndrome
Patient with non-infectious conjunctivitis, previously had
Chlamydia trachomatis infection and then developed
conjunctivitis and arthritis (HLA B27 positive) (MS022)
23. Psoriatic arthritis
Note disabling arthritis of the hands, nail pitting is
commonly present (not present in photo) (MS023)
24. Psoriatic arthritis
X-ray with "pencil in cup" deformity from erosive arthritis
of digits (MS024)
Musculoskeletal 3
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25. Septic arthritis due to disseminated
gonococcemia
Note the hot knee and the pustule on the wrist (MS025)
26. Septic arthritis
Note the gram negative diplococci in the neutrophil
(screen on your right) (MS026)
27. Lyme's disease
Note the Ixodes tick (vector of Borrelia burgdorferi and
Babesia microti), note the erythematous rash in the
bottom screen - the tick bite is in the center of the rash
and the rash extends out in concentric circles from that
point, the rash is called erythema chronicum migrans
(MS027)
28. Ganglion
Note the cystic mass on the wrist, ganglions are cysts
arising from the synovium or the tendon sheath, they
recurs unless removed surgically (MS028)
29. Pericardial fluid
Musculoskeletal 3
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Note the LE cell in the center of the slide, LE cells are
altered DNA phagocytosed by a neutrophil,
pericarditis/effusion is the most common cardiac
manifestation of SLE (MS029)
30. SLE: malar rash (MS030)
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Musculoskeletal 4
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Pathology I Images
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Musculoskeletal
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31. SLE
Histologic section of skin showing the lymphocytic
infiltrate hugging the basal layer and the outer portion of
the hair follicles (causes alopecia) (MS031)
32. SLE
Fluorescent staining for DNA in this skin biopsy shows a
linear deposit of DNA along the basement membrane
corresponding the site where lymphocytes are attacking
the membrane, this is called the band test (MS032)
33. PSS
Sclerodactyly and digital infarcts in progressive systemic
sclerosis (MS033)
34. PSS
Tight facial features of PSS, note the telangiectasias on
the skin (MS034)
Musculoskeletal 4
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35. PSS
Raynaud's phenomenon in PSS, note color variations
(MS035)
36. PSS
X-ray of hand and forearm showing extensive dystrophic
calcification (calcinosis) (MS036)
37. Dermatomyositis (DM)
Note the history in this 10 yr old girl, Gottron's patches
are noted over the PIP joints and the purplish
discoloration around the eyes are characteristic features,
muscle biopsy shows a lymphocytic infiltrate, CK levels
are always increased (MS037)
038.jpg (12265 bytes) 38. Sjogren's syndrome
Note dry tongue from immune destruction of minor
salivary glands (MS038)
Musculoskeletal 4
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39. Osteogenesis imperfecta
AD disorder with defect in synthesis of type I collagen,
note the blue sclera- loss of collagen in sclera allows
bluish color of choroidal vessels to shine through
(MS039)
40. Osteoporosis
Note the collapse of the vertebra due to loss of bone
mass, postmenopausal osteoporosis is due to the loss of
the inhibitory effect of estrogen on the release of
interleukin 1 from osteoblasts; hence patients lose more
bone than is replaced (MS040)
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Musculoskeletal 5
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Pathology I Images
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Musculoskeletal
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41. Osteoporosis
Dowager's hump
(MS239)
42. Aseptic necrosis of
femoral head
Note the reactive bone
formation; causes
include femoral neck
fracture, corticosteroids,
sickle cell disease, Legg-
Perthes disease
(MS042)
43. Clubbing of the
fingers
Hypertrophic
osteoarthropathy in the
underlying digit is
causing this reaction,
noted in chronic lung
diseases and cancer
(MS043)
Musculoskeletal 5
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44. Exostoses
(osteochondroma)
Note the cartilaginous
cap on the surface of the
bone. This causes a
protuberance of the
bone. This is the most
common benign bone
tumor. (MS044)
45. Chondrosarcoma
of the hip (MS045)
46. Osteogenic
sarcoma
Note metaphyseal origin
of the cancer and
extension into the
muscle, note the splinter
of periosteum that is
elevated which would
correspond to Codman's
triangle (MS046)
47. Osteogenic
sarcoma
X-ray of proximal
humerus showing the
"sunburst" appearance of
osteogenic sarcoma that
is extending into the
muscle, osteogenic
implies that the cancer is
making bone (MS047)
48. Neurogenic
atrophy
Musculoskeletal 5
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Note atrophy of the
muscle bundles
secondary to denervation
(MS048)
49. Duchenne's
muscular dystrophy
Note the
pseudohypertrophy of
the calf muscles, the
child is pushing himself
up from the down
position (Gower's
maneuver), SXR disease
with deficiency of
dystrophin (MS049)
50. Myotonic
dystrophy
AD disorder that is a
triplet repeat (problem
with anticipation -
disease gets worse in
future generations), note
balding head and
sagging face, patient's
cannot relax their grip
on something, cardiac
disease/cataracts/
testicular atrophy are
also present (MS291)
Musculoskeletal 5
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051.jpg (17887 bytes)
51. Myasthenia gravis
Autoantibody against Ach
receptors, note lid lag on
your left and open eyes
after administration of
Tensilon
(acetylcholinesterase
inhibitor) - blocking
acetylcholine esterase
allows a buildup of Ach,
which stimulates existing
receptors (MS051)
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Musculoskeletal 5
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CNS 1
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Pathology II Images
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Central Nervous System
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1. Dead neurons in the cerebral cortex illustrating
apoptosis (individual cell necrosis)
Note the absence of inflammation, eosinophilic
cytoplasm, and pyknotic nucleus. This patient had
cerebral atrophy from ischemia. (CNSOO1)
2. Silver stain of a senile plaque in a patient with
Alzheimer's disease
The outside part of the plaques is degenerated parts of
neurons and the center, if stained for amyloid, would be
positive indicating the presence of b-amyloid protein
coded by chromosome 21. (CNSOO2)
3. Cerebellar Purkinje cell with an eosinophilic viral
inclusion (Negri body) in a patient who died of
rabies. (CNSOO3)
4. Newborn with a noncommunicating
hydrocephalus from stenosis of the aqueduct of
Sylvius. (CNSOO4)
CNS 1
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5. Cross-section through midbrain illustrating
Duret's hemorrhages secondary to uncal herniation
of the temporal lobe through the tentorium
cerebelli
CN III palsy (eye down and out, mydriasis of pupil,
ptosis of the eyelid) and compression of the posterior
cerebral artery (hemorrhagic infarction of the occipital
lobe) may also occur. (CNSOO5)
6. Herniation of the cerebellar tonsils through the
foramen magnum. (CNS006)
7. Anencephaly, the worst of the open neural tube
defects
Note the absence of the brain. The fetal adrenal cortex
is also absent. (CNS007)
8. Café-au-lait spot and axillary freckling
consistent with neurofibromatosis (AD disease).
CNS lesions include meningiomas, acoustic neuromas,
and optic gliomas. (CNSOO8)
CNS 1
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9. Plexiform neurofibroma in a patient with
neurofibromatosis. (CNS009)
10. Sturge Weber syndrome (AD disease) with port
wine stain in the distribution of the ophthalmic and
maxillary division of CN V.
Patients have an ipsilateral AV malformation with tram
tracking (vessel calcification). They frequently suffer
epileptic seizures and are mildly mentally retarded.
(CNS010)
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CNS2
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Pathology II Images
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Central Nervous System
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11. Creamy exudate at the base of the brain in a
patient with bacterial meningitis. (CNS011)
12. CSF gram stain showing neutrophils and a
single Gram negative diplococcus, representing
Neisseria meningitidis, the most common cause of
meningitis from 1 month to 18 years of age.
(CNS012)
13. Sections through the brain of a child who died
of congenital CMV showing periventricular
calcification (dystrophic calcification)
CNS calcification may also occur with congenital
toxoplasmosis and congenital Herpes. (CNS013)
14. Cerebral abscess
Note the shaggy wall of the abscess. This, like CNS
infarction, is an example of liquefactive necrosis.
(CNS014)
CNS2
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15. Woman with Herpes zoster involving the ophthalmic
division of CN V. (CNS015)
16. India ink preparation of CSF showing
Cryptococcus neoformans (most common cause of
CNS fungal disease in immunocompromised
patients)
Note the narrow-based bud and clear area around the
yeast representing the thick capsule.CNS 016: India ink
preparation of CSF showing Cryptococcus neoformans
(most common cause of CNS fungal disease in
immunocompromised patients). Note the narrow-based
bud and clear area around the yeast representing the
thick capsule. (CNS016)
17. Wide-angled, non-septate hyphae of Mucor in a
patient with diabetic ketoacidosis. (CNS017)
18. Monoclonal stain of the brain illustrating cysts
of Toxoplasma gondii, the most common cause of a
space-occupying lesion in the brain in a patient
with AIDS. (CNS018)
19. Multiple spaces in the CNS representing cysts in
a patient with cysticercosis due to Taenia solium.
CNS2
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Recall that in cysticercosis, the egg of the tapeworm is
ingested by the patient and the egg develops into larvae
(cysticerci), which gain access to the blood stream and
disseminate to the CNS and other sites. These patients
commonly have epileptic seizures. (CNS019)
20. Epidural hematoma
Note the arterial blood clot on top of the dura. It is due
to a fracture of the temporoparietal bone with rupture of
the middle meningeal artery, which under arterial
pressure creates an epidural space. (CNS020)
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CNS3
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Central Nervous System
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21. Subdural hematoma
Note that the dura is reflected back from the clot, which
is held on the leading edge by forceps. Subdural
hematomas are most often seen in patients with
cerebral atrophy who hit their head causing rupture of
one or more of the bridging veins between the dura and
arachnoid membranes. (CNS021)
22. Pale CNS infarction due to a platelet clot
overlying an atherosclerotic plaque at the
bifurcation of the internal carotid artery
Note the asymmetry of the left side of the brain from
edema. The close-up shows early loss of the normally
well defined demarcation between gray and white mater
and some early liquefactive necrosis in the white mater.
(CNS022)
23. Old CNS atherosclerotic infarct demonstrating
cystic cavities devoid of brain tissue. (CNS023)
24. Embolic stroke
Embolic strokes are most often secondary to an embolus
(clot, vegetation) from the left side of the heart to the
middle cerebral artery causing a hemorrhagic infarction.
Note how the blood extends to the surface of the brain.
The infarct is hemorrhagic owing to reperfusion of the
vessel once the clot is dissolved in the middle cerebral
artery. Most atherosclerotic infarcts are pale because
they do not reperfuse. (CNS024)
CNS3
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25. Hypertensive (intracerebral) bleed
Note the location of the clot (not infarct) in the
putamen/globus pallidus/internal capsule area of the
brain. Recall than in hypertension the lenticulostriate
vessels (derivatives of the middle cerebral artery)
develop Charcot-Bouchard aneurysms and these
aneurysms rupture producing the intracerebral clot.
(CNS025)
26. Subarachnoid hemorrhage in a patient with a
rupture of a congential berry aneurysm located at
the junction of the anterior communicating branch
with the anterior cerebral artery.
Blood covers the surface of the brain. Recall the
relationship of these aneurysms with coarctation of the
aorta and adult polycystic kidney disease. (CNS026)
27. AV malformation of the middle cerebral artery
These lesions commonly rupture and produce
subarachnoid hemorrhages. This patient may have had
Sturge Weber syndrome. (CNS027)
28. Lacunar infarcts in the area of the internal
capsule
These are small infarcts associated with hyaline
arteriolosclerosis of vessels in the setting of diabetes
mellitus and essential hypertension. The unique
characteristic of these types of strokes is that they tend
to be pure motor or pure sensory strokes. (CNS028)
29. Demyelinating plaques at the angles of the
CNS3
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ventricles in a patient with multiple sclerosis.
(CNS029)
30. Severe atrophy of the brain in a patient with
Alzheimer's disease
Note that large ventricles (hydrocephalus ex vacuo) that
are due to loss of brain substance rather than increased
pressure. (CNS030)
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CNS4
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Central Nervous System
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31. Substantia nigra in a patient with Parkinson's
disease
Note the depigmentation of the substantial nigra.
(CNS031)
32. Depigmented neuron (normally synthesize
dopamine) in the substantia nigra in a patient with
Parkinson's disease showing eosinophilic inclusions
representing Lewy bodies. (CNS032)
33. Static photograph of a patient with Parkinson's
disease showing the blank face, stooped posture and
what would be a resting tremor of the thumb and
forefinger (pill rolling). Remember that the problem is
one of muscle rigidity and not spasticity (UMN sign).
(CNS033)
34. Mamillary bodies illustrating hemorrhages with
hemosiderin deposition in a patient with Wernicke's
encephalopathy (alcoholic with thiamine
deficiency). (CNS034)
CNS4
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35. Brain showing asymmetry in the left
hemisphere secondary to a low-grade astrocytoma.
(CNS035)
36. Brain illustrating a glioblastoma multiforme in
the frontal lobe
Note that GBMs exhibit hemorrhagic necrosis and that
they have a propensity for crossing the corpus callosum
into the other hemisphere. A GBM is the most common
primary brain tumor in adults. (CNS036)
37. Meningioma (second most common primary
tumor of the CNS in adults, most common benign
tumor in adults) attached to the undersurface of the
dura, which has been reflected back from the surface of
the brain. Note that the brain underlying the
meningioma appears irritated and most likely resulted in
seizure activity in the patient. (CNS037)
38. Section of a meningioma showing the last of
the psammoma bodies. (CNS038)
39. Section through a benign acoustic neuroma
(schwannoma, neurilemoma) showing the classic
CNS4
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"zebra" pattern.
The dark areas represent Antoni A areas and the lighter
areas in between are Antoni B areas. Patients present
with nerve deafness and sensory changes on the face
from compression of CN V in the cerebellopontine angle.
Recall the relationship of these tumors with
neurofibromas. Acoustic neuromas are the third most
common tumor in the CNS and derive from Schwann
cells. (CNS039)
40. Multiple metastatic foci in the brain in a patient
who had a primary lung cancer. (CNS040)
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CNS 5
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Central Nervous System
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41. Xanthelasma of the eyelid
It is secondary to cholesterol deposition in macrophages
in the underlying subcutaneous tissue and may
represent a type II hyperlipidemia. (CNS041)
42. Stye on the eyelid due to Staphylococcus
aureus. (CNS042)
43. Bacterial conjunctivitis
Note the conjunctival irritation and pus. Streptococcus
pneumoniae, Streptococcus pyogenes, H. influenzae, S.
aureus are common offenders. Blurry vision is not a
feature of conjunctivitis. (CNS043)
44. Special stain of the conjunctiva showing a
dendritic ulcer consistent with Herpes simplex
keratoconjunctivitis. (CNS044)
CNS 5
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45. Patient with subconjunctival hemorrhages
secondary to coughing
This should not be confused with a hyphema, which is
blood in the anterior chamber of the eye. (CNS045)
46. Patient with bilateral arcus senilis
This is a degenerative change that is common in the
elderly. If noted in a young person, a lipid profile should
be ordered. (CNS046)
47. Papilledema in a patient with increased
intracranial pressure
Note the loss of demarcation of the optic disk, the flame
hemorrhages, and cotton wool exudates representing
areas of retinal infarction. (CNS047)
48. Optic atrophy
Note the loss of physiologic cupping and the paleness of
the optic disk. (CNS048)
49. Retinoblastoma
This is the most common primary eye cancer in
children. In some cases, it has an AD inheritance
pattern. The Rb suppressor gene is located on
chromosome 13. (CNS049)
50. Inflamed eardrum in a patient with otitis media
CNS 5
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Note the loss of the light reflex and red tympanic
membrane. S. pneumoniae, H. influenzae, and B.
catarrhalis are the most common causes in descending
frequency. (CNS050)
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Infectious Disease- Bacteria 1
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Pathology II Images
Syllabus | Lecture Schedule | Images - Pathology I | Images - Pathology II
Infectious Disease
Bacteria
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1. Mueller-Hinton plate for antibiotic
susceptibility:
Discs with lucency around them indicate
susceptibility of the organism for the
antibiotic (Id244)
2. Gram positive cocci in clusters
(Staphylococcus aureus) in a patient
with an abscess on the skin:
Note the relation of the bacteria with
neutrophils. Coagulase keeps the
organisms clumped together. (Id239)
3. Abscess of the wrist- Staphylococcus
aureus:
Note the erythema surrounding the
abscess. It drains via a sinus tract.
(Id396)
4. Monocytes with phagocytosed cocci
of Staphylococcus aureus:
The patient had septicemia due to the
organism. An indwelling venous catheter is
the MCC. (Id404)
Infectious Disease- Bacteria 1
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5. Group A Streptococcus pharyngitis
(Streptococcus pyogenes):
Note the pus on the tonsils. Most exudative
tonsillitis is due to a viral infection.
Rheumatic fever may be a complication
(immunologic disease). (Id237)
6. Patient with desquamating rash of
scarlet fever due to group A
Streptococcus:
Due to an erythrogenic strain of group A
streptococcus. Post-streptococcal
glomerulonephritis may be a complication
(immunologic). (Id319)
7. White coated tongue in a patient
with scarlet fever due to Streptococcus
pyogenes:
Initial appearance of the tongue before
desquamation (Id400)
8. Strawberry tongue in a patient with
scarlet fever due to Streptococcus
pyogenes:
Appearance of the tongue after
Infectious Disease- Bacteria 1
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desquamation (Id399)
9. Patient with impetigo due to
Streptococcus pyogenes:
Note the honey colored crusty lesions.
Bullous lesions imply a superinfection with
Staphylococcus aureus. (Id325)
10. Child with impetigo due to
Streptococcus pyogenes:
Note the honey colored crusty lesions.
(Id335)
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Infectious Disease-Bacteria 2
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Infectious Disease
Bacteria
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11. Patient with erysipelas due to
Streptococcus pyogenes:
Cellulitis related to hyaluronidase
(Id333)
12. Patient with erysipelas due to
Streptococcus pyogenes
cellulitis: Cellulitis related to
hyaluronidase (Id401)
13. Ludwig's angina due to
Streptococcus pyogenes:
Cellulitis extending into the fascial
planes (Id413)
14. Schematic of gram positive
diplococci (Streptococcus
pneumoniae):
Note that the diplococci are lancet
shaped (Id235)
Infectious Disease-Bacteria 2
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15. Gram stain of sputum with
gram positive diplococci-
Streptococcus pneumoniae:
Note relationship with neutrophils.
MCC of typical, community acquired
pneumonia. (Id245)
16. Gram stain of sputum with
gram positive diplococci-
Streptococcus pneumoniae
(Pneumococcus):
Note relationship with neutrophils.
MCC of typical, community acquired
pneumonia. (Id336)
17. Dental caries due to
Streptococcus mutans:
Acts on sucrose to produce dextran,
which enhances plaque formation
(Id412)
18. Schematic of gram negative
diplococcus (e.g., Neisseria
species):
Note that the diplococci are coffee
bean-shaped (Id242)
19. Child with Neisseria
meningitidis sepsis:
Note the petechial lesions, which are
characteristic. Septicemia and
Infectious Disease-Bacteria 2
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meningitis are MC in the 1 mth to
18 yr old bracket. Waterhouse
Friderichsen's syndrome is a
potential complication. (Id001)
20. Gram negative diplococcus in
spinal fluid- Neisseria
meningitidis:
Note the single neutrophil with a
phagocytosed meningococcus
(Id248)
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Infectious Disease-Bacteria 3
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Pathology II Images
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Infectious Disease
Bacteria
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21. Purpuric lesions in
disseminated meningococcemia
due to Neisseria meningitidis:
Petechia and purpuric lesions are
common findings in sepsis (Id402)
22. Creamy penile and cervical
discharge of Neisseria
gonorrhoeae:
Symptoms appear within the first
week of sexual exposure (Id376)
23. Neutrophil (1o'clock) with
gram negative diplococci-
Neisseria gonorrhoeae:
Note the neutrophil with
phagocytosed organisms (Id360)
24. Bilateral tuboovarian
abscesses due to Neisseria
gonorrhoeae:
Note the exudate in the lumen of
the tubes and extension to both
ovaries. Ectopic pregnancies are a
common sequelae. (Id359)
Infectious Disease-Bacteria 3
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25. Fibrous bands connecting
parietal peritoneum with surface
of the liver (Fitz-Hughes-Curtis
syndrome)- perihepatitis
Neisseria gonorrhoeae:
In PID, pus gets under the parietal
peritoneum and along the surface
of the liver. Healing occurs with
scar tissue formation. PID due to
Chlamydia trachomatis does the
same thing. (Id375)
26. Pustules on the wrist, palm,
and foot in disseminated
gonococcemia due to Neisseria
gonorrhoeae:
Dissemination mainly occurs in
women who are asymptomatic
carriers. Complement deficiencies
involving C5-C9 predispose to
dissemination. Septic arthritis
involving the knee, tenosynovitis
involving the hands and feet, and
pustules in the hands and feet are
common findings. (Id374)
27. Gram positive rods- Listeria
monocytogenes:
This organism is the third MCC of
neonatal sepsis/meningitis and
commonly produces meningitis in
immuno-compromised patients.
Pregnant women should avoid
eating soft cheeses. The organism
exhibits tumbling motility. (Id252)
28. Fish handler with erysipeloid
due to Erysipelothrix
rhusiopathiae (gram positive
rod):
Note the purplish colored rash.
Veterinarians, butchers, and fish
handler's are most likely to develop
this disease. (Id234)
29. Gray pseudomembrane in
posterior pharynx due to
Infectious Disease-Bacteria 3
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Corynebacterium diphtheriae:
People who are not immunized are
at risk for developing infection.
Note the shaggy pseudomembrane
that is probably interfering with
swallowing. (Id233)
30. Pseudomembrane in trachea
due to Corynebacterium
diphtheriae:
The toxin damages the mucosa and
submucosa. The organism is not
invasive. (Id394)
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Infectious Disease-Bacteria 4
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Pathology II Images
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Infectious Disease
Bacteria
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31. Bull's neck lymphadenopathy
associated with Corynebacterium
diphtheriae:
Lymphadenopathy from drainage of the
infected area is profound (Id232)
32. Patient with acne vulgaris-
Propionibacterium acnes:
This gram positive anaerobe produces
lipases that convert sebum into fatty acids,
which irritate the hair follicle leading to
acne (Id334)
33. Gram positive rods in stool-
Clostridium difficile:
This organism is part of the normal flora of
stool. However, when antibiotics are
administered (e.g., ampicillin, clindamycin)
bacteria that normally keep C. difficile in
check are destroyed allowing for rapid
proliferation and the potential for
pseudomembranous colitis. (Id254)
34. Pseudomembranous colitis due to
Clostridium difficile:
Similar to the C. diphtheriae,
pseudomembranous colitis is a noninvasive,
toxin-induced disease with
formation of a pseudomembrane. A toxin
assay of stool is the gold standard for Dx.
Metronidazole is the Rx of choice. (Id381)
Infectious Disease-Bacteria 4
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35. Myonecrosis and subcutaneous gas
due to Clostridium perfringens (gas
gangrene):
Note the gas in the subcutaneous tissue.
This organism is also associated with septic
endometritis from illegal abortions and food
poisoning. (Id228)
36. Gram positive rods from a wound-
Clostridium perfringens:
Note the scant number of organisms in the
wound (Id249)
37. Mydriasis in Clostridium botulinum
infection:
Note the dilated pupil. The toxin irreversibly
blocks the release of acetylcholine from
cholinergic receptors leading to flaccid
paralysis of muscle. Diplopia from eye
muscle paralysis is the first sign. The toxin
is used clinically to Rx muscle spasm
disorders. (Id229)
38. Newborn with Clostridium tetani:
Note the arching of the back due to spasm
of the erector spinae muscles.
Tetanospasmin binds to ganglioside
receptors of spinal afferent fibers and
blocks release of the inhibitory
neurotransmitter glycine in the spinal cord
leading to sustained muscle contractions.
The jaw is the first site of involvement
followed by the facial muscles. Infections of
the umbilicus in newborns and improper
debridement of dirty wounds predispose to
the infection. (Id002)
39. Gram positive rods with terminal
spore- Clostridium tetani:
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Note the terminal spore. The space is clear,
since the spore is located inside the cell
wall of the organism. (Id253)
40. Patient with risus sardonicus due to
Clostridium tetani:
Classic appearance of facial muscle
contraction (Id411)
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Infectious Disease-Bacteria 5
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Pathology II Images
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Infectious Disease
Bacteria
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41. Spores of Bacillus anthracis:
This special stain demonstrates the
spore within the bacillus (Id236)
42. Malignant pustule of Bacillus
anthracis:
This is the characteristic appearance of
cutaneous anthrax. The black scab is
called an eschar. Inhalation anthrax is
invariably fatal. (Id238)
43. Patient with draining sinus under
the chin due to Actinomyces israeli:
Note the yellow sulfur granule in the
draining sinus. The patient had an
abscessed tooth removed a few weeks
before the sinus developed secondary to
osteomyelitis in the mandible. In
addition to producing sinus tracts in the
jaw, thorax, and abdomen, it also is
associated with endometritis related to
intrauterine devices. Actinomyces is an
anaerobic, gram positive filamentous
bacteria. (Id417)
44. H and E stain of sulfur granule of
Actinomyces israeli:
The sulfur granule contains the
organisms. (Id004)
Infectious Disease-Bacteria 5
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45. Gram positive filamentous
bacteria in sulfur granule-
Actinomyces israeli:
Note the branching filaments (Id414)
46. Acid fast stain of Nocardia
asteroides (filamentous gram
positive bacteria):
The cell wall of Nocardia contains
mycolic acid, hence the acid-fastness of
the bacteria. Unlike Actinomyces, it is
aerobic. (Id226)
47. Gram negative rods in urine- E.
coli:
Note the fat gram negative rods. It is
the MCC of upper and lower urinary
tract infections, sepsis and endotoxic
shock in a hospitalized patient with an
indwelling urinary catheter, and
spontaneous peritonitis in patients with
cirrhosis and ascites. (Id246)
48. Necrotic pseudomembrane in the
rectosigmoid in a patient with
Shigella sonnei enteritis:
The pseudomembrane is easily mistaken
for C. difficile and also the necrotic
changes associated with ulcerative
colitis. The enteritis is characterized by
bloody diarrhea (definition of dysentery).
(Id038)
49. Rose spots on abdomen in a
patient with typhoid fever due to
Salmonella typhi:
Salmonella is a facultative intracellular
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parasite, hence it hosts a mononuclear
rather than neutrophil response in
tissue. Like M. tuberculosis and bovis, it
invades Peyer's patches in the terminal
ileum. The first week is the bacteremic
phase and the second is associated with
a vasculitis producing the rose spots on
the upper anterior trunk plus the classic
triad of hepatosplenomegaly,
bradycardia, and neutropenia. Humans
are the reservoir for the bacteria.
(Id405)
50. Fat gram negative rods in
sputum of a patient with lobar
pneumonia- Klebsiella pneumoniae:
Pneumonia in alcoholics is commonly
due to Klebsiella. The thick capsule often
shows up on gram stain (see clearing
around the bacteria) and is also
apparent in sputum, which is often
mucoid and bloody. Abscess formation
commonly occurs. (Id247)
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Pathology II Images
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51. Silver stain of Legionella
pneumophila:
Legionella organisms stain weakly gram
negative, however, they are easily
visualized with the Dieterle silver stain.
They are facultative intracellular bacteria
and are water loving. They produce an
atypical type of pneumonia with high fevers.
(Id006)
52. Edema of epiglottis due to
Hemophilus influenzae:
Note the swelling of the epiglottis in this
patient. The swelling on a lateral x-ray
resembles a thumbprint. Inspiratory stridor
is present. (Id416)
53. Painful penile ulcer of Hemophilus
ducreyi (chancroid):
Unlike primary syphilis, the ulcer is painful
rather than painless (Id352)
54. Gram stain showing gram negative
rods with a "school of fish" orientation-
Hemophilus ducreyi (chancroid):
Note how the bacteria orient themselves in
the same direction (Id373)
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55. Silver stain of antrum of stomach
with Helicobacter pylori in mucous
layer:
These bacteria are urease producers, which
convert urea into ammonia, which destroys
the mucous barrier, hence predisposing to
gastric and duodenal ulcers. Gastric
adenocarcinoma and low-grade malignant
lymphoma are also associated with the
organism. (Id464)
56. Macrophage with Donovan bodies in
a patient with granuloma inguinale due
to Calymmato-bacterium granulomatis:
The organisms resemble the yeast forms of
Histoplasma and the leishmanial forms of
leishmaniasis (Id371)
57. Creeping ulcers of granuloma
inguinale due to Calymmato-bacterium
granulomatis:
Unlike other STDs, granuloma inguinale is
not associated with lymphadenopathy
(Id372)
58. Cervical Pap smear with "clue cell"
in patient with bacterial vaginosis due
to Gardnerella vaginalis:
Note the granular appearance of the
superficial squamous cell due to bacteria
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sticking to the surface of the cell. Bacterial
vaginosis is not an infection but an
alteration in the pH of the vaginal fluids to
> 5.5. No inflammation is present except a
malodorous vaginal discharge. Rx is
metronidazole. (Id356)
59. Inflamed scratch site of a cat with
subsequent development of cat scratch
fever due to Bartonella henselae:
Similar to Legionella, Bartonella organisms
do not stain well with gram stain. Silver
stains identify the organism. Bartonella
henselae is also the cause of bacillary
angiomatosis, a vascular inflammation only
seen in AIDS. It simulates Kaposi's
sarcoma. (Id224)
60. Silver stain of Treponema pallidum:
Similar to Legionella and Bartonella
henselae, treponemes visualize best with a
silver stain. Note the corkscrew appearance
of the organisms. These can penetrate
intact skin. (Id007)
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61. Dark field showing
Treponema pallidum:
A dark field analysis of fluid from a
lesion of primary or secondary
syphilis is considered the gold
standard for diagnosing syphilis
(Id370)
62. Endarteritis obliterans and
plasma cell infiltrate in vasculitis
due to Treponema pallidum:
The pathology of syphilis is related
to a vasculitis involving small
vessels. The vessel is to your right.
The lumen is reduced owing to the
inflammatory infiltrate around the
vessel. Plasma cells are easily
identified by looking for a
peripherally oriented nucleus.
Plasma cells are a key feature for
the vasculitis of syphilis. (Id397)
63. Painless penile chancre in
primary syphilis due to
Treponema pallidum:
The ulcer is due to the endarteritis
obliterans beneath the epidermis,
which decreases blood flow causing
ischemic necrosis of the overlying
skin. Since nerves are around
vessels, they are also destroyed,
hence the painless features of the
ulcer. (Id355)
64. Syphilitic chancre due to
Treponema pallidum and
discharge due to Neisseria
gonorrhoeae:
This patient has two STDs, primary
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syphilis and gonorrhea (Id407)
65. Erythematous palmar rash in
secondary syphilis due to
Treponema pallidum:
The rash of secondary syphilis may
be generalized (Id354)
66. Condyloma latum of the labia
in secondary syphilis due to
Treponema pallidum:
Note the flat lesions around the
labia. These lesions are often
confused with condyloma acuminata
due to HPV. (Id353)
67. Gummas in skull in a patient
with tertiary syphilis due to
Treponema pallidum:
Gummas are very destructive,
witness the fact that the bone in the
skull has been destroyed leaving
cystic spaces (Id395)
68. Pegged teeth and destruction
of palate in congenital syphilis
due to Treponema pallidum:
Congenital syphilis is vertically
transmitted after 5 months (Id357)
69. Pegged teeth of congenital
syphilis due to Treponema
pallidum:
Note the notching of the incisors
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(Hutchinson's teeth) (Id240)
70. Perioral scarring, saddle nose
deformity of congenital syphilis
due to Treponema pallidum:
Note collapse of the nasal septum
producing a saddle nose deformity
and the perioral scarring that raises
the lip up (Id358)
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71. Borrelia recurrentis spirochetes in
peripheral blood:
Borrelia recurrentis is the cause of relapsing
fever. It is relapsing owing to the
emergence of new antigen types, similar to
what is seen in African sleeping sickness.
Ticks and lice may transmit the disease.
Note the loosely wound spirochetes in the
blood. (Id305)
72. Ioxides dammini (tick) and
erythema chronicum migrans in a
patient with Lyme's disease due to
Borrelia burgdorferi:
Note the concentric nature of the rash,
which is pathognomonic of early Lyme's
disease. The white tailed deer is the
reservoir for the spirochete. Ioxides also
carries Babesia microti, with is an
intraerythrocytic parasite that produces a
hemolytic anemia. (Id366)
73. Silver stain demonstrating the
shepherd's crook appearing spirochete
of Leptospira interrogans:
Dogs are the most important reservoir for
the spirochete and infected urine is the
primary source of the infection. Hepatitis
and renal disease are common
complications. (Id250)
74. Conjunctivitis associated with
Leptospira interrogans:
Note the red conjunctiva in the eye on your
right. Conjunctivitis with photophobia occurs
during the septicemic phase of the disease.
(Id223)
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75. Gross of lung with abscess due to
aspiration or oropharyngeal materialmixed
aerobic and anaerobic bacteria:
The abscess cavity is in the posterior
segment of the right upper lobe, therefore,
the patient must have aspirated infected
oropharyngeal material while lying on their
right side. Oropharyngeal material contains
aerobic and anaerobic organisms (e.g.,
Fusobacterium). (Id340)
76. Gram stain with mixed aerobic and
anaerobic bacteria:
Note the mixture of gram positive and
negative organisms some of which are cocci
and others rods (Id415)
77. Granuloma with acid fast bacteria-
Mycobacterium tuberculosis:
The organism is a strict aerobe and is an
obligate intracellular organism. It is killed
by activated macrophages (type IV
hypersensitivity). Mycolic acid is responsible
for its acid-fastness. (Id306)
78. Granulomas in the lung due to
Mycobacterium tuberculosis:
Note the well circumscribed, pink staining
granulomas with multinucleated giant cells.
Most of the pink staining cells are activated
macrophages called epithelioid cells. Central
areas of caseation are not present. (Id008)
79. Cavitary lesion with caseous
necrosis in the lung apex-
Mycobacterium tuberculosis:
Note the cheesy material in the cavitary
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lesion representing caseous necrosis.
Reactivation TB occurs in the apex of the
lungs owing to the high O2 concentration in
the apex. (Id348)
80. Gross of lung with miliary
tuberculosis due to Mycobacterium
tuberculosis:
Miliary TB may occur in primary or
reactivation TB. Note the millet seed sized
white granulomas in the parenchyma.
(Id220)
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Infectious Disease-Bacteria 9
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81. Vertebral fracture due to
Mycobacterium tuberculosis (Pott's
disease):
Extrapulmonary spread of TB to the
vertebral column is called Pott's disease.
Note the vertebral fracture from destruction
of one of the vertebra. (Id010)
82. Stricture of the terminal ileum in a
patient with intestinal tuberculosis due
to Mycobacterium tuberculosis:
Intestinal TB in the United States is due to
swallowing TB from a primary site in the
lungs. TB enters the lymphoid tissue in
Peyer's patches in the terminal ileum
(similar to Salmonella typhi) and spreads
through the lymphatics, which are
circumferentially oriented in the intestine.
Reaction to injury is fibrosis, which
produces a stricture resulting in obstruction.
M. bovis from unpasteurized milk is the
MCC in third world countries. (Id410)
83. Leonine face of a patient with
lepromatous leprosy due to
Mycobacterium leprae:
Note the nodular lesions in the face that
give the patient a leonine appearance.
Lepromatous leprosy exhibits a lack of
cellular immunity, hence a negative
lepromin skin test, the presence of
organisms in tissue, and the absence of
granuloma formation, which requires an
intact cellular immunity. (Id219)
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84. Skin biopsy in lepromatous leprosy
demonstrating a Grenz zone and foamy
macrophages with Mycobacterium
leprae:
Due to the lack of cellular immunity in
lepromatous leprosy, skin biopsies
demonstrate organisms in macrophages.
Note that the macrophages (pink staining
cells) are located deep in the subcutaneous
tissue. The zone directly beneath the basal
cell layer is free of macrophages. This is
called the Grenz zone. (Id218)
85. Microscopic section with acid-fast
stain of foamy macrophages in lamina
propria in a patient with Whipple's
disease due to Mycobacterium aviumintracellulare
(MAI):
Disseminated MAI, an atypical
Mycobacterium, is the MC type of
Mycobacterium in AIDS patients.
Macrophages in the lamina propria of the
small bowel are filled with the organisms.
There is obstruction to lymphatic flow out of
the small bowel leading to malabsorption.
(Id243)
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Infectious Disease - Fungi 1
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1. Patient with tinea corporis due to
Trichophyton rubrum:
Note the circular lesions with the red
borders and pale centers. KOH
preparations should be taken from
scrapings from the red border. (Id332)
2. KOH preparation of yeast and
hyphae of Trichophyton rubrum in a
patient with tinea corporis:
Note the thread-like hyphae and
occasional yeast forms (Id331)
3. Tinea capitis with positive Wood's
lamp due to Microsporum canis:
Note the green fluorescence on the left
in an area of alopecia. The organism
invades the outer sheath of the hair
follicle, hence the positive Wood's lamp.
Trichophyton tonsurans is the MCC of
tinea capitis. It invades the inner hair
shaft, hence a negative Wood's lamp.
(Id310)
4. Tinea pedis due to Trichophyton
rubrum:
Note the white area between the toes.
(Id309)
Infectious Disease - Fungi 1
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5. Onychomycosis due to
Trichophyton rubrum:
Note the nail discoloration. The finger on
your left has a paronychial infection,
most likely related to the fungus,
however, it could also be due to
Staphylococcus aureus. (Id384)
6. Malassezia furfur in stratum
corneum in patient with tinea
versicolor:
Note the spaghetti (hyphae) and meat
ball (yeasts) in the stratum corneum
layer of the skin. This is where all
superficial dermatophyte infections are
located. Topical imidazole compounds
easily penetrate this layer. (Id266)
7. KOH preparation showing
"spaghetti and meatballs"
appearance of hyphae and yeasts of
Malassezia furfur:
Malassezia infections include tinea
versicolor and seborrheic dermatitis. It is
disseminated in patient's with AIDS.
(Id330)
8. Patient with seborrheic dermatitis
due to Malassezia furfur:
Note the flaky appearance of the skin.
Seborrheic dermatitis on the scalp is
called dandruff. (Id307)
9. Newborn with Candida albicans
diaper rash:
Note the fiery red appearance of the
skin (Id329)
Infectious Disease - Fungi 1
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10. Tongue of a patient with Candida
albicans glossitis:
Note the white pseudomembrane
covering the tongue. The patient was
HIV positive. It is not AIDS-defining.
(Id350)
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11. Cottage cheese discharge of
vaginal infection with Candida
albicans:
Note the white exudate and fiery red wall
of the vagina (Id367)
12. Pseudohyphae and yeasts of
Candida albicans from a urine sample:
Presence of pseudohyphae indicates
infection, while the presence of only yeasts
is considered normal (Id269)
13. Cervical Pap smear with
pseudohyphae and yeasts of Candida
albicans:
Presence of pseudohyphae indicates
infection, while the presence of only yeasts
is considered normal (Id308)
Infectious Disease - Fungi 2
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14. Patient with maduromycosis
(mycetoma) of the foot due to
Pseudoallescheria boydii:
This is a subcutaneous mycosis due to
traumatic implantation. Note the numerous
draining sinus tracts. Amputation is
frequently necessary. (Id386)
15. Lymphocutaneous nodules of
Sporothrix schenckii:
This is a subcutaneous mycosis due to
traumatic implantation, in this case a thorn
from a rose bush. Note the puncture mark
below the second metacarpophalangeal
joint. Lymphocutaneous nodules are
located on the dorsum of the arm. The
patient also has rheumatoid arthritis and
osteoarthritis. (Id324)
16. Gram positive yeasts in a monocyte
in peripheral blood- Candida albicans
sepsis:
The patient had a catheter in the
subclavian vein. The fungus commonly
produces metastatic abscesses and is a
vessel invader that produces infarctions.
(Id265)
17. Silver stain of spherule in lungs
containing endospores- Coccidioides
immitis:
This fungus is common in the Southwest.
Arthrospores are located in dust and are
inhaled. (Id264)
18. Spherule in lung with endospores
in a patient with Coccidioides immitis
infection:
This fungus is common in the Southwest.
Infectious Disease - Fungi 2
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Arthrospores are located in dust and are
inhaled. (Id390)
19. India ink preparation of
Cryptococcus neoformans:
Clear area around the ink is the thick
capsule. Note narrow-based bud. MC
fungus in CNS in immunocompromised
patient. (Id268)
20. Silver stain showing narrow-based
buds of Cryptococcus neoformans in
the brain:
Some of the budding yeasts have a Mickey
Mouse ears appearance. (Id347)
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21. Calcified granulomas in the lungs
due to Histoplasma capsulatum:
MC systemic fungal infection. Associated
with bats and Starlings. Located in Ohio-
Tennessee valley and Mid-west. Simulates
TB. Notorious for dystrophic calcification of
granulomas. (Id262)
22. Monocytes in peripheral blood with
phagocytosed yeast forms of
Histoplasma capsulatum:
Only systemic fungus with yeast form
located in monocytes or macrophages.
Patient had disseminated disease. (Id341)
23. Alveolar macrophage with yeast
forms of Histoplasma capsulatum:
Only systemic fungus with yeast form
located in monocytes or macrophages.
(Id345)
Infectious Disease - Fungi 3
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24. Facial lesion of Blastomyces
dermatitidis:
Verrucoid appearance of the rash is
confused with squamous cancer (Id261)
25. Yeast with broad-based bud in a
section of lung- Blastomyces
dermatidis:
Note the wide base of the bud (Id342)
26. Broad-based bud of Blastomyces
dermatidis:
Note the wide base of the bud (Id389)
27. Silver stain showing "ship's wheel"
configuration of yeast forms of
Paracoccidioides brasiliensis:
Occurs in Central and South America
(Id012)
28. Bilateral apical cavities with fungal
invasion- Aspergillus fumigatus:
"Fungus balls" in old TB cavities. Note the
hazy densities in the cavities. Aspergillus is
Infectious Disease - Fungi 3
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also associated with extrinsic asthma and
hemorrhagic infarctions of the lungs (vessel
invader). (Id346)
29. Corona and septate hyphae of
Aspergillus fumigatus:
Fruiting body of Aspergillus looks like a
crown (Id014)
30. Silver stain showing arrow-angled,
septate hyphae of Aspergillus fumigatus
(Id015)
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31. Frontal lobe of brain showing wideangled,
non-septate hyphae of Mucor
species in a patient with diabetic
ketoacidosis:
Rhinocerebral mucormycosis is unique to
diabetic ketoacidosis. The fungus is a vessel
invader. (Id337)
32. Wide-angled, non-septate hyphae of
Mucor species (Id387)
33. Histologic section of lung showing
foamy alveolar infiltrate of
Pneumocystis carinii pneumonia:
MC AIDS-defining opportunistic infection.
Occurs with CD4 T helper cell count is under
200 cells/ÂμL. Rx with
trimethoprim/sulfamethoxazole. (Id039)
34. Silver stain of Pneumocystis carinii:
Note the crushed ping pong ball appearance
(Id257)
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35. Silver stain showing Pneumocystis
carinii cysts in the lungs:
Note the crushed ping pong ball appearance
(Id344)
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Pathology II Images
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1. Flask shaped ulcer in cecum due to
Entameba histolytica:
In the middle of the biopsy, there is defect
in the mucosa and a stream of
inflammatory cells extending out into the
lumen of the bowel (bottom of the slide)
and into the submucosa. Organisms are
not visible at this magnification. (Id440)
2. Entameba histolytica trophozoites
with erythrophagocytosis and necrotic
debris from ulcer in the cecum:
The red dots in the trophozoites represent
RBCs (Id302)
3. Cecal biopsy showing trophozoites of
Entameba histolytica:
Note erythrophagocytosis (Id429)
4. Needle aspirate of liver abscess in a
patient with amebiasis due to
Entameba histolytica:
Note the brown discoloration of the
aspirate fluid, which some have described
as having an "anchovy paste" appearance
(Id424)
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5. CT of liver showing an abscess due
to Entameba histolytica:
Trophozoites gain entry into the portal
vein tributaries draining the cecum. Most
abscesses are in the right lobe. Rx is
metronidazole. (Id436)
6. Naegleria fowleri in the brain:
Naegleria is an ameba. The infection is
usually contracted from swimming in fresh
water lakes that are stagnant. (Id298)
7. Small bowel biopsy showing
Cryptosporidium parvum acid-fast
oocysts in mucous layer:
Cryptosporidium is a sporozoan that is the
MCC of diarrhea in patients with AIDS. It
is a frequent contaminant of reservoirs and
produces epidemics of diarrhea (e.g.,
Milwaukee). Entero-Test (string test) is
positive. (Id040)
8. Brain with cyst of Toxoplasma
gondii:
Toxoplasma is a sporozoan. It is the MCC
of a space occupying lesion in the brain in
a patient with AIDS. It generally occurs
when the helper T cell count is < 100
cells/Âμ/L. Pregnant women should avoid
changing cat litter. (Id425)
9. Multiple ring forms in RBCs in
patient with Plasmodium falciparum
infection:
Plasmodium species are sporozoans.
Infectious Disease - Parasite 1
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Falciparum malaria only has ring forms
and gametocytes in the peripheral blood.
Multiple infestation of RBCs by ring forms
is a characteristic finding of this type of
malaria. Fever and hemoglobinuria
coincide with intravascular rupture of the
RBCs. Extravascular hemolysis by
macrophages also occurs. (Id280)
10. Peripheral blood with ring forms
and multiple infestation of RBCs-
Plasmodium falciparum:
Multiple infestation of RBCs by ring forms
is a characteristic finding of this type of
malaria. (Id437)
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Pathology II Images
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11. Peripheral blood with a bananashaped
gametocyte of Plasmodium
falciparum:
No ring forms are noted in the slide.
Note that the gametocyte is not located
within an RBC. (Id281)
12. Pinpoint hemorrhages in
cerebellum in a patient with cerebral
malaria due to Plasmodium
falciparum:
Cerebral malaria is associated with
hemorrhage of the small vessels since
infected RBCs agglutinate and stick to
the wall of the blood vessels causing
blockage to blood flow and eventual
rupture. (Id296)
13. Fever patterns of Plasmodium
species:
Fever coincides with intravascular
hemolysis of the RBCs. Plasmodium
falciparum (left side of the schematic)
has a quotidian pattern, which refers to
daily spikes of fever that persist for a
few days and occasionally break every
couple of days. Plasmodium vivax or
ovale have a tertian pattern (middle of
the schematic), which is fever q. 48 hrs.
Plasmodium malariae has a quartan
pattern (right of the schematic), which
occurs q. 72 hrs. (Id282)
14. Colon biopsy demonstrating
Balantidium coli:
Balantidium is a ciliate. It produces
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colonic ulcers leading to bloody diarrhea.
(Id434)
15. Duodenal aspirate showing
trophozoites of Giardia lamblia:
Giardia is a flagellate. Note the owl eye
appearance of the organism. It produces
chronic diarrhea often associated with
malabsorption. Entero-Test (string test)
is positive. Rx is metronidazole. (Id042)
16. Hanging drop preparation of
Trichomonas vaginalis:
Trichomonas is a flagellate. Note the
pear shaped organisms. There are no
cyst forms for this organism. (Id351)
17. Frothy greenish discharge of
Trichomonas vaginalis vaginitis:
It is considered an STD. Rx patient and
partner with metronidazole. (Id368)
18. Vaginal vault in a patient with
vaginitis due to Trichomonas
vaginalis:
Note the intense erythema and pus of
the mucosa (Id369)
19. Trypanosomal form in blood in
Infectious Disease - Parasite 2
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African sleeping sickness due to
Trypanosoma brucei gambiense
(hemoflagellate):
Only the extracellular form
(trypanosomes) are present in this
disease. The vector is the tsetse fly.
Prominent posterior cervical
lymphadenopathy is called
Winterbottom's sign. Similar to relapsing
fever due to Borrelia recurrentis, there is
antigen variation. Death is by starvation.
(Id433)
20. Reduvid bug:
Also called the "kissing bug" is the vector
for the American trypanosomiasis due to
Trypanosoma cruzi (Id016)
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Pathology II Images
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21. Romana's sign in girl- Chagas
disease due to Trypanosoma cruzi:
Note the periorbital edema due to
rubbing the eye when the Reduvid bug
defecates in this area. Both
trypanosomes (extracellular) and
leishmanial forms (intracellular) are
present in the disease. Xenodiagnosis is
where a sterile Reduvid bug is allowed to
bite the patient and then the bug is
examined for the organism. (Id277)
22. Leishmanial forms of
Trypanosoma cruzi in cardiac muscle:
Chronic heart failure from myocarditis is
a common cause of death in South and
Central America. Leishmanial forms also
destroy ganglion cells in the distal
esophagus and rectum causing acquired
achalasia and Hirschsprung's disease,
respectively. (Id276)
23. Leishmanial forms of Leishmania
donovani complex (visceral
leishmaniasis) phagocytosed by a
macrophage:
In leishmaniasis, only the leishmanial
form is present in disease. Phlebotomus
(sandfly) is the vector for the disease.
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Visceral leishmaniasis is called kala azar
and is characterized by massive
splenomegaly and eosinophilia.
Macrophages contain the leishmanial
forms, which are very similar in
appearance to the yeast forms of
Histoplasma and the Donovan bodies in
granuloma inguinale. (Id289)
24. Skin lesions of cutaneous
leishmaniasis due to Leishmania
tropica complex:
Note the circular sores on the arm.
Common problem in the Gulf war in the
Middle East. (Id297)
25. Scotch tape preparation taken
from the perianal area showing egg
of Enterobius vermicularis (pinworm,
nematode):
Note the flat side to the embryonated
egg. Anal pruritus is the key feature of
the disease and is due to the adult
worms laying eggs around the anus in
the early morning hours. There is no
eosinophilia, since it is non-invasive.
Using two-sided tape and compressing it
around the anus attaches to the eggs
and allows for easy diagnosis under the
microscope. Rx is albendazole (Id275)
26. Bowel with Trichuris trichiura
(nematode):
Trichuris trichiura is also called the
whipworm. Note the organisms attached
to the cecum. Patients experience
diarrhea and children may develop rectal
prolapse. Rx is albendazole. (Id018)
27. Egg of Trichuris trichiura:
Note the characteristic egg with a plug at
both ends (Id422)
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28. Child with passage of adult
Ascaris lumbricoides worms
(nematodes) and x-ray
demonstrating location in the bowel:
Larval phase is in the lungs and
produces cough, pneumonitis, and
eosinophilia. Adults cause intestinal
obstruction and are not invasive, hence
no eosinophilia. (Id045)
29. Adult worms of Ascaris
lumbricoides:
Adults cause intestinal obstruction and
are not invasive, hence no eosinophilia.
Rx is albendazole or mebendazole.
(Id274)
30. Gross of small bowel showing
adult worms of Necator americanus
(nematode) attached to villi:
Necator is also called a hookworm. The
larval phase is in the lungs and is
swallowed. The mouth parts of adults
attach to the tips of villi leading to blood
loss and iron deficiency anemia.
Filariform larva produced from the eggs
of adult worms infect the soil and can
penetrate the feet. Rx is albendazole.
(Id043)
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Infectious Disease - Parsite 4
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31. Skin tracts of migrating larval
forms ("creeping eruption") of
Ancylostoma braziliensis
(nematode):
Cutaneous larva migrans is caused
by dog and cat hookworms. It is
usually contracted by children
playing on sandy beaches or sandy
playgrounds where dogs and/or cats
urinate. Larvae penetrate the skin
and produce serpiginous tunnels in
the skin which causes intense
pruritus and scratching along with
eosinophilia. Adults do not form in
man (intermediate host), only in
infected dogs and cats (definitive
hosts). Rx is ethyl chloride spray and
ivermectin. (Id055)
32. Bowel with Strongyloides
stercoralis (nematode):
Infective filariform larvae in the soil
penetrate the skin and migrate to
the lungs. They are swallowed and
develop into adult worms which
burrow into the wall of the bowel,
where they mate and lay eggs which
hatch rhabditiform larvae, which
enter the lumen and are passed into
feces. In soil, they molt and produce
the infective filariform larvae.
Autoinfection and superinfection
(especially in AIDS) may occur.
Positive Entero-Test (string test). Rx
is ivermectin or albendazole.
(Id019)
33. Rhabditiform larva in stool
preparation of Strongyloides
stercoralis:
Note that this is the only worm that
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does not normally pass eggs in the
stool (Id293)
34. Trichinella spiralis
(nematode) in skeletal muscle:
Contracted by eating poorly cooked
pork containing the encysted larvae.
Larva are released after digestion
and develop into adult forms that
mate and produce additional larvae.
They penetrate the bowel mucosa
and are hematogenously spread
throughout the body, particularly
skeletal muscle where they become
encysted (often calcified). Rx is
corticosteroids and albendazole.
(Id273)
35. Eye swelling in patient with
trichinosis due to Trichinella
spiralis:
Periorbital edema due to larva
(Id287)
36. Patient with lymphedema due
to Wucheria bancrofti (nematode)
infection:
Microfilaria of Wucheria bancrofti or
Brugia malayi are the causative
agents of filariasis. Vector is
mosquitos. Microfilaria circulate in
the bloodstream at night and enter
into the lymphaticsg mature and
produce an inflammatory reaction
resulting in lymphedema
(elephantiasis) of the legs, scrotum,
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etc. Rx is ivermectin. (Id272)
37. Scrotal lymphedema due to
lymphatic blockage by Wucheria
bancrofti:
See above discussion (Id435)
38. Subcutaneous nodule on the
head of a child with Onchocerca
volvulus (nematode):
Microfilaria are transmitted to man
via the bite of an infected blackfly
(Simulium). Larva migrate into the
skin and lymphatic tissue and
differentiate into adults. Adults
produce microfilaria that migrate
across the eye and produce
blindness, hence the name "river
blindness." Microfilaria do not enter
the bloodstream and there is no
periodicity (night or day time
rhythm). Rx is ivermectin and
surgical removal of the nodules.
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(Id303)
39. Adult worms of Oncocerca
volvulus in subcutaneous tissue:
See above discussion (Id301)
40. Microfilaria of Oncocerca
volvulus migrating across the eye
(river blindness):
See above discussion (Id418)
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41. Patient with Dracunculus
medinensis (nematode):
Infective larvae of Dracunculus medinensis
(guinea worm) are contracted by man after
eating the fresh water crustacean Cyclops.
Larvae migrate through the intestinal tract
into deep subcutaneous tissue where they
develop into migrating adults that attain
great length (longest worm). Rx is surgical
removal of pre-emergent worm +
metronidazole. (Id021)
42. Brain with cysticercosis due to the
larval form of Taenia solium (pork
tapeworm, cestode):
Note multiple cyst cavities in the brain. In
the adult worm infection in man, man
contracts the disease by eating larvae in
undercooked pork (man definitive host).
Adult worms mate in the intestine to
produce eggs. In cysticercosis, the patient
eats the eggs from a human host which
develop into larvae called cysticerci (man is
the intermediate host), which disseminate
throughout the body (e.g., eyes, brain) and
produce cysticercosis. CNS lesions produce
seizures. Rx is praziquantel. (Id022)
43. Liver cyst with scolices of
Echinococcus granulosus (cestode):
The life cycle is as follows: sheep with
larvae (intermediate host)g eaten by dog
(develop adults who lay eggs, definitive
host)g man ingests the egg (develops
larvae which penetrate the liver,
intermediate host). Note the fluid filled
hydatid cysts that contain thousands of
scolices (see next slide). Cyst fluid is highly
antigenic and may produce an anaphylactic
reaction if cyst fluid enters the peritoneum.
Common disease in Greek and Basque
sheepherders. Rx is percutaneous drainage
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+ albendazole (Id304)
44. Scolex of Echinococcus granulosus
(cestode):
Note the scolex, which has hooks for
attachment if it ever developed into an
adult, which it cannot do in man (Id421)
45. Schistosoma mansoni (trematode)
egg:
Note the sharp lateral spine. Schistosomes
have the following life cycle: egg (human)g
ciliated miracidia larvaeg infect snails (1st
intermediate host)g produce fork tailed
cercaria larvaeg penetrate skin of humang
produce disease (Id271)
46. Patient with hepatosplenomegaly,
ascites, and esophageal varices (x-ray)
due to pipestem cirrhosis secondary to
Schistosoma mansonii:
S. mansonii favors the intrahepatic portal
veins. Penetration of the skin by the larvae
of S. mansonii produces pruritus
("swimmers itch"). Larvae develop into adult
worms that travel against the portal vein
circulation and deposit eggs, to which the
host develops an inflammatory response
marked by concentric fibrosis ("pipe stem
cirrhosis") in the vessel wall (see next
slide). This leads to portal hypertension with
ascites (note abdominal distension,
splenomegaly (note outline of enlarged
spleen), and esophageal varices (note the
barium study of the esophagus). Rx is
praziquantel. (Id047)
47. Liver biopsy with "pipestem
cirrhosis" due to eggs of Schistosoma
mansonii:
Note the concentric circles of fibrosis around
the egg of Schistosoma mansonii. (Id427)
48. Schistosoma hematobium
(trematode) egg in urine:
Note the nipple at one end of the egg
(Id270)
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49. Urinary bladder with squamous
metaplasia due to Schistosoma
hematobium:
Note the numerous eggs in the submucosal
venous plexus and the keratinization of the
transitional epithelium just off center and to
the left. Squamous cancer is a potential
complication. Rx is praziquantel. (Id430)
50. Common bile duct with Clonorchis
sinensis (trematode):
The life cycle for non-schistosomal disease
is as follows: 3. in non-schisto-somal
disease, the cycle is as follows: egg
(human) g ciliated miracidia larvae g infect
snails (1st intermediate host) g produce
fork tailed cercaria larvae g infect a 2nd
intermediate host: • aquatic vegetation
(Fasciolopsis buski, Fasciola hepatica), •
fish (Clonorchis sinensis), • crabs
(Paragonimus westermani) g form infective
metacercaria g man ingests the 2nd
intermediate host g disease. In
clonorchiasis, the patient ingests larvae in
fish (usually fish paste). Larvae ascend the
bile ducts and enter the liver and
gallbladder and become adults in the bile
ducts (present in this slide). Jaundice and
cholangiocarcinoma are potential
complications. Rx is praziquantel. (Id439)
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51. Scorpion (arthropod):
Poisonous species capable of causing
fatality live in Southwestern deserts
(Centruroides gertschi). The poison is a
neurotoxin. The bite site shows no
initial reaction g increased sensation g
no sensation in the area of the bite g
whole extremity becomes numb g
increased blood pressure g ascending
motor paralysis g death. (Id431)
52. Intertriginous burrow in an
adult with scabies due to the human
itch mite (Sarcoptes scabies,
arthropod):
The human itch mite causes tissue
injury by adult females boring into the
stratum corneum (see below). Burrows
are visible as dark lines between the
fingers, at the wrists, on the nipples,
or on the scrotum. Females lays eggs
at the end of the tunnel, which
produces intense pruritus. In adults,
the disease is limited to the webs
between the fingers and other
intertriginous areas and spares the
soles, palms, face and head. In infants,
there are no burrows and a rash occurs
on the palms, soles, face and head
(see below). Rx is permethrin cream or
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lindane (alternative drug). (Id292)
53. Rash on hand in a child with
scabies due to the human itch mite:
See above discussion (Id291)
54. Microscopic of human itch mite
imbedded in epidermis in a patient
with scabies:
See above discussion (Id295)
55. Hair on scalp with Pediculus
humanis capitis (head louse) and
"nits-eggs" on the hair shafts:
The louse lays its "nits" (eggs) on hair
shafts. Rx is permethrin (kills newly
hatched lice) followed by lindane
(Kwell), if the initial Rx is unsuccessful.
Combs for removing the lice are
available. Monkeys are outstanding for
removal. (Id056)
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Infectious Disease: Virus, Chlamydia, Rickettsia, Mycoplasma
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Infectious Disease: Virus, Chlamydia, Rickettsia, Mycoplasma
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Virus
1. Hand-foot-mouth disease due to
coxsackie virus:
Vesicular rash in these areas (Id207)
2. Buccal mucosa with lesions of
herpangina due to coxsackie virus:
Note erythematous areas with white colored
ulcers (Id447)
3. Herpangina due to coxsackie virus:
Note erythematous areas with white colored
ulcers (Id463)
Infectious Disease: Virus, Chlamydia, Rickettsia, Mycoplasma
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4. Myocarditis due to coxsackie virus:
Note the lymphocytic infiltrate with
destruction of cardiac cells. MCC of
myocarditis and common cause of
congestive cardiomyopathy. (Id448)
5. Patient with verruca vulgaris on
fingers due to human papilloma virus:
Note the verrucoid appearance of the
lesion. They may also occur on the plantar
surface of the foot. (Id312)
6. Condyloma acuminata (venereal
wart) of the penis due to human
papilloma virus:
Note the fern-like appearance of the lesion.
Due to HPV 6, 11. (Id363)
7. Condyloma acuminata of shaft of
penis due to human papilloma virus:
Note verrucoid appearance of lesions
(Id455)
8. Condyloma acuminata of labia due to
human papilloma virus:
These lesions could easily be confused with
condyloma latum in secondary syphilis
Infectious Disease: Virus, Chlamydia, Rickettsia, Mycoplasma
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(Id457)
9. Cervical biopsy demonstrating
koilocytosis of squamous cells due to
human papillomavirus:
Note the squamous cells with spaces in the
cytosol and pyknotic nuclei. These cells
contain the virus. (Id362)
10. Child with gingivostomatitis due to
Herpes simplex:
Primary herpes infections are systemic in
that they have fever and painful
lymphadenopathy. Infections usually occur
in children and cause painful ulcerations on
the lips and in the oral cavity. (Id210)
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Virus
11. Patient with recurrent Herpes
simplex involving the upper and lower
lips:
Recurrent herpes is not systemic. Viruses
remain latent in sensory ganglia and may
recur at any time. (Id052)
12. Perianal vesicles in a male
homosexual with Herpes genitalis:
Recurrent herpes in perianal area related to
unprotected anal intercourse (Id450)
13. Genital ulcers of labia in a woman
with Herpes genitalis: Recurrent herpes
(Id365)
Infectious Disease: Virus, Chlamydia, Rickettsia, Mycoplasma
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14. Tzanck prep with multinucleated
squamous cell with intranuclear
inclusions in a patient with Herpes
genitalis:
Tzanck preps involve unroofing a vesicle
and scrapping the base of the lesion.
Herpes inclusions are intranuclear.
Squamous cells are usually multinucleated.
Varicella has similar inclusions. (Id364)
15. Temporal lobe necrosis due to
Herpes simplex encephalitis:
Produces significant neurologic damage
(Id458)
16. Herpes simplex esophagitis in a
patient with AIDS:
Note multinucleated squamous cells with
intranuclear inclusions. This is an AIDSdefining
opportunistic infection and
produces odynophagia. (Id208)
17. Finger with herpetic whitlow due to
Herpes simplex:
Due to traumatic implantation. Common in
dentists. (Id209)
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18. Herpetic whitlow on finger due to
Herpes simplex:
Due to traumatic implantation. Common in
dentists. (Id316)
19. Dendritic ulcer of the eye due to
Herpes simplex:
Note the root-like ulceration of the
conjunctiva (Id451)
20. HIV positive patient with hairy
leukoplakia due to Epstein Barr virus
infection of the tongue:
The lesion is painless and leaves a bloody
base when scrapped off. It is not AIDSdefining,
however, it commonly occurs just
prior to an AIDS-defining opportunistic
infection. It is treated with acyclovir, but
recurs once Rx is stopped. (Id053)
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Virus
21. Basophilic intranuclear inclusions of
cytomegalovirus in a lung biopsy:
Many of the cells are enlarged and contain
nuclei with large basophilic intranuclear
inclusions. Ganciclovir is the Rx of choice.
(Id206)
22. Lung biopsy showing cell with large
basophilic intranuclear inclusion of
cytomegalovirus:
Cell with large basophilic intranuclear
inclusion (Id050)
23. Gross of periventricular calcification
in the brain of a child with congenital
cytomegalovirus infection:
CMV is the MC congenital infection. Urine is
the best culture medium. (Id214)
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24. Microscopic of periventricular
calcification in the brain of a child with
congenital cytomegalovirus infection:
CMV is the MC congenital infection. Urine is
the best culture medium. (Id215)
25. Patient with roseola (exanthem
subitum) due to HSV-6:
Patients initially have very high fevers and
then as the fever subsides a maculopapular
rash appears as noted in this patient
(Id320)
26. Vesicles and pustules of varicella:
Note that they are in different stages of
development. There is an association with
Reye syndrome if patients receive
salicylates. (Id315)
27. Herpes zoster in outer ear canal
(Ramsay Hunt syndrome):
Note the vesicles in the outer ear. This is
the sensory division of CN VIII. The virus is
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latent in cranial ganglion cells. (Id313)
28. Herpes zoster (shingles) involving
the ophthalmic division of CN V:
Note also the irritation of the conjunctiva,
whose afferent is CN V. (Id314)
29. Herpes zoster involving dermatome
on lower back:
Vesicles follow a dermatome (Id200)
30. Patient with Herpes zoster involving
shoulder:
Vesicles follow a dermatome (Id326)
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Virus
31. Influenza pneumonia with
secondary bacterial pneumonia with
abscess due to Staphylococcus aureus:
Influenza commonly produces a viral
pneumonia that gets superinfected by a
bacteria, usually Staphylococcus aureus.
(Id212)
32. Child with mumps involving the
parotid gland:
Note the bilaterally enlarged parotid glands.
Serum amylase is elevated. (Id031)
33. Patient with mumps involving both
parotid glands:
Note the bilaterally enlarged parotid glands.
Serum amylase is elevated. (Id049)
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34. Patient with mumps orchitis: Note
the enlarged, red scrotal sac. Unilateral
orchitis is the rule, hence infertility is
uncommon. (Id048)
35. Child with rubeola (regular
measles):
Note the runny nose and the maculopapular
rash (Id311)
36. Koplik spots on buccal mucosa in
rubeola:
Note the erythematous buccal mucosa and
the white spots superimposed on the base.
The rash follows these lesions. (Id029)
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37. Warthin-Finkeldey multinucleated
giant cell in rubeola: These are commonly
found in lymphoid tissue (e.g., appendix)
and in the lungs in measles pneumonia.
(Id030)
38. Woman with rash of rubella:
Note the maculopapular rash in this
woman, who happens to be pregnant.
Rubella is teratogenic unlike rubeola.
Arthritis and painful postauricular
lymphadenopathy are common findings.
Sensorineural hearing loss is the MC
complication of congenital rubella. (Id322)
39. Slapped face appearance of
parvovirus:
Also called fifth's disease (erythema
infectiosum). Parvovirus also produces
aplastic anemia, pure RBC aplasia,
spontaneous abortions, and arthritis.
(Id028)
40. Molluscum contagiosum (Poxvirus):
Note the umbilicated lesions with the
granular material in the center. These
resolve spontaneously in a few weeks to
months. (Id026)
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Virus
41. Molluscum contagiosumpoxvirus:
Note the umbilicated lesions with the
granular material in the center. These
resolve spontaneously in a few weeks to
months. (Id328)
42. Histologic section of molluscum
contagiosum:
The crateriform appearance is apparent.
The dark staining squamous cells contain
molluscum bodies representing the virus.
(Id027)
43. Neuronophagia of anterior horn
cells by microglial cells in patient with
polio: Patients develop paralysis, which
may or may not resolve. The infection
occurs in the summer months. (Id205)
44. Purkinje cell with Negri body in
rabies: Note the eosinophilic
intracytoplasmic inclusion of the virus.
Skunks are the MCC of rabies in the
United States. (Id449)
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45. Needle tracks of arms in IV drug
abuser with chronic hepatitis B:
The MC systemic infection in IV drug
abuse is HBV. The MC infection
transmitted by an accidental needle stick
is also HBV owing to its high viral burden
in the blood. (Id460)
Chlamydia
46. Cervical Pap smear showing
vacuoles with elementary bodies
(dots) in a patient with Chlamydia
trachomatis infection:
Chlamydia trachomatis is the MC STD.
Infection occurs during the second week
after sexual exposure. In men, it is called
nonspecific urethritis while in women it is
called the acute urethral syndrome.
(Id361)
47. Newborn with ophthalmia
neonatorum due to Chlamydia
trachomatis:
This infection is transmitted via
contamination of the eyes by an infected
endocervix during delivery. Erythromycin
eye drops at birth help prevent this
infection. (Id378)
48. Elementary body of Chlamydia
trachomatis in a conjunctival
scrapping in a patient with trachoma:
Trachoma is the MCC of global blindness
(Id216)
49. Patient with trachoma due to
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Chlamydia trachomatis:
Note the cornea scarring (Id217)
50. Vulvar lymphedema in a patient
with lymphogranuloma venereum due
to a subtype of Chlamydia
trachomatis:
LGV initially begins with papules (no
ulcers) and then develops granulomatous
microabscesses in the inguinal lymph
nodes. Lymphatic strictures are common
leading to lymphedema. (Id377)
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Rickettsia
51. Dermacentor andersoni tickvector
for Rocky mountain spotted
fever: (Id284)
52. Petechial hemorrhages on palms
of hand in Rocky mountain spotted
fever due to Rickettsia rickettsii:
In RMSF, the petechial rash begins on
the palms and spreads to the trunk
(Id454)
53. Vasculitis of Rickettsia rickettsii
in Rocky mountain spotted fever:
The rickettsial organisms invade the
endothelial cells of small vessels
producing a vasculitis, which is
responsible for the petechial lesions.
(Id446)
Mycoplasma
54. Chest x-ray with patchy
infiltrates of Mycoplasma
pneumoniae pneumonia:
Mycoplasma are the smallest free living
organisms and the MCC of atypical
pneumonia. Note the interstitial
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infiltrate in the chest x-ray. Bullous
myringitis and a cold autoimmune
hemolytic anemia due to anti-I
antibodies are complications of this
infection. (Id445)
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