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1
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Cutaneous tag
Benign elevated piece of normal skin, may be hyper- keratotic or hyperpigmented

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2
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Histiocytoma
Benign ‘Button tumor’ common in young dogs

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3
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Trichoepithelioma
Solid or cystic skin lesion filled with caseous material

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4
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Squamous cell carcinoma
Common to see in white cats’ pinnae and nose, usual-
ly curable with wide excision, sun protection advised

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5
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Calcinosis circumscripta
Chalky or granular lesions; toothpaste-like consis- tency - skin and tongue lesions in young large breed dogs

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6
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Hemangioma
Well-circumscribed blood-filled channels, often con-
fused with melanomas

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7
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Osteochondrosis dissecans (OCD) > degenerative joint disease (DJD)
With both conditions you will see loss of cartilage with eburnation and osteophyte formation in both. DJD is seen in older dogs while OCD is seen in young animals

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8
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Skull hemorrhage in birds Bird Common post-mortem finding in birds; do not con-
fuse this with traumatic hemorrhage

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9
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Physeal dysplasia with slipped capital epiphysis Seen in young overweight male cats

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10
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Uremic mineralization of pleura
Common uremic change, not to be confused with
carcinomatosis

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11
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Carcinomatosis
Pleural manifestation of carcinomas from various sites (mammary gland, lung, prostate, etc). Firm tan plaques and nodules = carcinoma cells & desmoplas- tic (fibroplasia) response

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12
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FIP (pleural)
Feline Infectious Peritonitis affecting the pleura in
cats

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13
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Nasal carcinoma vs fungal rhinitis

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14
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Widened dorsal membrane of trachea
Common in chondrodystrophic dog breeds, known
as ‘collapsing trachea’

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15
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Tracheal foam
Common post-mortem finding. Some foam is normal,
but excessive foam indicates pulmonary edema

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16
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Normal lung

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17
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Apical emphysema / overinflation
Post-mortem finding in cats with no clinical signifi- cance - note red lines on caudal lung lobes (rib im- pressions secondary to ascites)

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18
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Subpleural macrophage foci
Common finding in cats, rats, and ferrets. Foci are more apparent when there is pulmonary edema. Eti- ology is unknown. No clinical significance.

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19
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Anterior mediastinal hemorrhage
Associated with anticoagulant rodenticide intoxica-
tion

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20
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Lung lobe torsion

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21
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Chronic bronchitis/bronchiolitis with atelectasis Lesions seen with chronic feline asthma

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22
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Metastatic carcinoma
common with carcinomas from many sites

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23
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Hemangiosarcoma
one of the most common causes of death from neo- plasia in the dog. Many animals die from acute hemo- pericardium or hypovolemic shock associated with hemoabdomen

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24
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Hemangiosarcoma

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25
Right atrial Hemangiosarcoma specific location for HSA
26
Pulmonary artery thrombus Lesion causing dyspnea and death. Commonly missed lesion post-mortem
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Euthanasia artifact Post-mortem brown discoloration & brown/gold gran- ular precipitates on endocardium, which can extend to epicardium. With excessive euthanasia fluid, you can see discoloration of lungs and liver
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Euthanasia artifact Post-mortem brown discoloration & brown/gold gran- ular precipitates on endocardium, which can extend to epicardium. With excessive euthanasia fluid, you can see discoloration of lungs and liver
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Idiopathic epicarditis Usually seen on right ventricle. Due to acute to chron- ic inflammatory changes
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Chicken fat clot Smooth fibrin clot easily removed post-mortem, not a thrombus (fibrin clots tend to stick to the endotheli- um)
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Epicardial hemorrhage Common non-specific finding - can also be seen with coagulopathies and vasculitis
32
Feline cardiomegaly cat Large heart with left ventricular hypertrophy and left atrial dilation/enlargement. Ddx: thyrotoxic car- diomegaly and cardiomyopathy (HCM & RCM aka LV endocardial fibrosis
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# cat
Feline cardiomegaly Large heart with left ventricular hypertrophy and left atrial dilation/enlargement. Ddx: thyrotoxic car- diomegaly and cardiomyopathy (HCM & RCM aka LV endocardial fibrosis
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Endomyocarditis
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Endomyocarditis
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Saddle thromboembolus Common sequela to feline cardiac disease
37
Endocardiosis Very common old age change in dogs. May be asso- ciated with valvular insufficiency, eccentric hypertro- phy and dilation of ventricle, and focal endocardial fibrosis of atrium (jet lesion). Later may have ruptured chordae tendonae with acute decompensation
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Endocardiosis with ruptured chordae tendinae and atrial tear and atrial thrombus
39
Vegetative endocarditis Warty valve proliferations on valve containing fibrin, inflammatory cells, and bacteria. Often associated with septic emboli to kidneys and elsewhere.
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Vegetative endocarditis Warty valve proliferations on valve containing fibrin, inflammatory cells, and bacteria. Often associated with septic emboli to kidneys and elsewhere.
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Vegetative endocarditis Warty valve proliferations on valve containing fibrin, inflammatory cells, and bacteria. Often associated with septic emboli to kidneys and elsewhere.
42
Uremic endocarditis
43
Epulis & gingival hyperplasia Epulis - common oral lesion in old dogs; benign ex- cept acanthomatous variety Gingival hyperplasia - very common in dogs; no clin- ical significance
44
Uremic ulceration of tongue Bilateral on ventral surface of tongue
45
Malignant melanoma Oral;, often metastasizes widely
46
Oral squamous cell carcinoma Common in cats; may metastasize to regional LNs and lung
47
Dilated ducts of esophageal submucosal glands Common old age change in dogs. No clinical signifi- cance
48
58. Persistant right aortic arch with esophageal obstruc- tion and megaesophagus in dogs
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Duodenal ulcer Uncommon but usually associated with cutaneous mast cell tumor
50
Parvoviral enteritis cat Hemorrhagic enteritis (panleukopenia)
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Parvoviral enteritis Hemorrhagic enteritis (panleukopenia)
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Parvoviral enteritis dog Hemorrhagic enteritis with "punched out" peyers patches
53
Normal cecal lymphoid follicles
54
ntussusception (Agonal) Smooth-walled, no discoloration, easily reduced
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Carcinomatosis (abdominal)
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Feline infectious peritonitis Abdominal effusion with fibrin plaques on serosal surfaces
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Feline infectious peritonitis Abdominal effusion with fibrin plaques on serosal surfaces
58
Steatosis (hepatic lipidosis) Fatty liver associated with all fish diets, now rare (thankfully)
59
Pacinian corpuscle (cats) Pressure receptor in cats' mesocolon, pancreas, skin. Normal pressure receptors
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73. Necrotic fat Gold-tan nodules, smooth, often pedunculated
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serrated liver edges = normal liver variation in dogs
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tension lipidosis Tension by fascial connections cause fatty change in hepatocytes
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Peliosis hepatis/Telangiectasia (cats) cat Dilation of sinusoids. Unknown etiology. No clinical significance
64
Chronic passive congestion ("nutmeg liver") Nutmeg liver pattern due to chronic right-sided heart failure
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79. Diffuse fatty change Physiological in starvation. Pathological in diabetes mellitus or toxins
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Steroid hepatopathy Enlarged yellow-orange liver due to hyperadrenocor- ticism or corticosteroid administration
67
Granulomatous hepatitis (due to Mycobacterial species) Common in birds and fish
68
Nodular hyperplasia Very very common old age change in dogs. Important to recognize and not confuse with neoplastic change
69
Nodular hyperplasia Very very common old age change in dogs. Important to recognize and not confuse with neoplastic change
70
Cystic mucosal hyperplasia (gall bladder) Common old age change in dog
71
Biliary cystadenoma Peripheral lobe gall bladder cyst in old cats, easily excised
72
Nodular acinar hyperplasia Common in dogs and cats, clinically insignificant
73
Pancreatic necrosis and pancreatic fat necrosis Release of enzymes causes enzymatic fat necrosis and saponification
74
Tonsilar lymphosarcoma
75
Cranial mediastinal lymphosarcoma Differentiate from thymoma
76
Siderofibrotic plaques Etiology unknown Commonly seen in dogs. Fibrous connective tissue, mineral, and blood pigments
77
Nodular hyperplasia of spleen Very common in dogs. Most common splenic "tu- mor". May be white pulp, red pulp, both, or myeloid
78
Lymphosarcoma (spleen) DDX: leukemia or MCT Diffuse enlargement of spleen with pink discol- oration.
79
Splenic infarcts Common. Seen on the periphery, well demarkated. Of- ten associated with splenic vein thrombi, lymphosar- coma, and other conditions
80
Hemangiosarcoma Look for foci in mesentery, liver, lungs, right heart, and brain
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Hemangiosarcoma
82
Herpes virus Causes multifocal renal necrosis and hemorrhage in puppies
83
Renal dysplasia Young dogs with renal failure due to abnormal kidney development
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100. Renal dysplasia Young dogs with renal failure due to abnormal kidney development
85
Chronic tubulointerstitial nephritis Very common in old cats and dogs. Can also some- times see tubular cysts & hydronephrosis
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Chronic tubulointerstitial nephritis & tubular cysts & hydronephrosis Very common in old cats and dogs.
87
Polar 'infarcts' Common lesion in cats. Poles of kidney have shrunk or disappeared. Fibrosis and tubular loss due to pyelonephritis vs infarcts
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Hydronephrosis secondary to obstruction (calculi, neoplasia, prostatomegaly)
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Renal infarct
90
Glomerulonephritis vs amyloid in this case it was glomerulonephritis associated with lyme nephritis
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Lymphosarcoma May be difficult to differentiate from nephritis due to FIP
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Nephritis due to FIP
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Nephritis due to FIP
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Calculi in urinary bladder & urethra
95
Cystic endometrial hyperplasia uterus Predisposes to pyometra
96
Follicular cysts of ovary Common in intact females. Often associated with cys- tic endometrial hyperplasia
97
Prostatic hypertrophy/hyperplasia Common in old intact male dogs
98
Interstitial cell/Leydig cell tumor Most common testicular tumor. Benign.
99
Sertoli cell tumor Firm, fibrous testicular tumor. Often functional, lead- ing to atrophy of contralateral testis and feminization. The majority are benign.
100
Sertoli cell tumor Firm, fibrous testicular tumor. Often functional, lead- ing to atrophy of contralateral testis and feminization. The majority are benign.
101
Seminoma Soft white bulging. Majority are benign
102
Seminoma Soft white bulging. Majority are benign
103
Bilateral parathyroid hyperplasia Secondary to Ca/P imbalance associated with chron- ic renal failure or improper diet
104
Bilateral parathyroid hyperplasia Secondary to Ca/P imbalance associated with chron- ic renal failure or improper diet
105
"Keyhole" foramen magnum Common in toy and miniature breeds, no clinical sig- nificance
106
Leptomeningeal fibrosis White firm plaques in sulci, common in old age change
107
Pituitary tumor May be functional and/or compress the brain
108
Poor fixation Thickly cut collected sections due to insufficient for- malin

pathology (2 decks)

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