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Flashcards in Path Lab Midterm Deck (40):
1

What species is the most common to get squamous cell carcinoma and where?

HORSE - penis/eyelid
dog/cat - skin
cow - eye/vulva

2

What is the round hyaline red stained structure in a squamous cell carcinoma?

keratin pearl

3

What is not a tumor that is seen on bovine eyes?

dermoid (adnexa present) - hyperplasia

4

What nailbed tumor is benign?

subungual keratoacnthoma - no breach of basal lamina

5

What 2 nail bed tumors are malignant?

subungual squamous cell carcinoma
subungual malignant melanoma

6

What species do not get papillomas?

cats

7

What species do fibropapillomas develop and where?

bovine penis and vagina (in young animals)

8

What are the 2 forms of papillomas in dogs?

oral papillomas
cutaneous papillomas

9

Where do papillomas occur on the horse?

nose and lips in young horses, regress quickly

10

Which species do not get fibromas?

dogs

11

What species get fibrosarcomas most commonly?

cats - virus, inflammation, vaccine

12

What causes fibrosarcomas in dogs?

spiro cerca lupi

13

What tissue is affected by rhabdomyomas?

striated muscle

14

What species get lipomas?

dog, cat, horse

15

Where do lipomas arise in horse? How can it be dangerous?

mesentary - death by strangulation

16

What is the origin of histiocytomas?

cutaneous macrophage (langerhan cells)

17

What does a histocytoma become in a dog?

button tumor - benign but grows fast

18

What are the important characteristics of TVT (transmissable venereal tumor)?

1. high incidence in temperate areas
2. grows as graft
3. locally invasive

19

What species gets melanoma/melanocytomas?

DOG - benign on skin, malignant on mucousa
gray horse - perianal/perineal
mini pigs

20

What species most commonly get mast cell tumors and where?

dog - skin, always eosinophils
cat - SPLEEN

21

What are the 3 forms of mast cell tumors in cats?

cutaneous - histiocytic, mast cell form
visceral - spleen, ulcers (can be in GI)
GI - no ulcers

22

What stain is used for poorly granulated mast cells in tumors?

toluidin blue

23

What is the most common neoplasia in animals?

lymphosarcoma

24

What 5 forms of lymphosarcoma do dogs get and what do they cause?

Multicentric form and mediastinal form - both cause hypercalcemia
Alimentary
cutaneous
extranodal

25

How much of hemopoietic tumors do lymphosarcomas cause in cats?

90%

26

What are lymphosarcomas caused by in cats?

FeLV

27

What form of lymphosarcomas do cats not get?

cutaneous

28

What are the 3 forms of sporadic lymphosarcomas in cattle?

calf, thymic, skin

29

What is the adult form of lymphosarcoma in cattle?

enzootic leukosis - BLV

30

What are the 3 forms of plasma cell tumors?

cutaneous plasmacytoma - old dogs, benign
extramedullary plasmacytoma - old dogs, rectal mucosa
multiple myeloma - rare, involvement of BM, hypercalcemia

31

What species get hamangiosarcomas and where?

dog - common, spleen
cat - liver

32

What are the clinical signs of hemangiosarcoma

50% die from sudden rupture
in heart - RA
thrombocytopenia = DIC in dog

33

What glands are involved most commonly for mammary gland tumors in cats?

2 anterior ones

34

What is a clinical sign of adenocarcinoma?

hypercalcemia (PTH like substance)

35

What describes a "peri anal" gland tumor?

dogs - hepatoid looking

36

What are seminomas associated with?

dog - cryptorchidism

37

Which species get leydig cell tumors? What do they look like?

old dog - rosettes around vessels

38

What species gets sertoli cell tumors and what do they cause?

dogs - feminization

39

What are ovarian tumors made of and what do they cause?

granuloma cell tumor
cow/horse - nymphomania, masculinization

40

Which species get uterus adenomas?

rabbit, cow