Path Lab Midterm

Question 1

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

Answer 1

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

Question 2

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

Answer 2

keratin pearl

Question 3

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

Answer 3

dermoid (adnexa present) - hyperplasia

Question 4

What nailbed tumor is benign?

Answer 4

subungual keratoacnthoma - no breach of basal lamina

Question 5

What 2 nail bed tumors are malignant?

Answer 5

subungual squamous cell carcinoma

subungual malignant melanoma

Question 6

What species do not get papillomas?

Answer 6

cats

Question 7

What species do fibropapillomas develop and where?

Answer 7

bovine penis and vagina (in young animals)

Question 8

What are the 2 forms of papillomas in dogs?

Answer 8

oral papillomas

cutaneous papillomas

Question 9

Where do papillomas occur on the horse?

Answer 9

nose and lips in young horses, regress quickly

Question 10

Which species do not get fibromas?

Answer 10

dogs

Question 11

What species get fibrosarcomas most commonly?

Answer 11

cats - virus, inflammation, vaccine

Question 12

What causes fibrosarcomas in dogs?

Answer 12

spiro cerca lupi

Question 13

What tissue is affected by rhabdomyomas?

Answer 13

striated muscle

Question 14

What species get lipomas?

Answer 14

dog, cat, horse

Question 15

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

Answer 15

mesentary - death by strangulation

Question 16

What is the origin of histiocytomas?

Answer 16

cutaneous macrophage (langerhan cells)

Question 17

What does a histocytoma become in a dog?

Answer 17

button tumor - benign but grows fast

Question 18

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

Answer 18

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

Question 19

What species gets melanoma/melanocytomas?

Answer 19

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

Question 20

What species most commonly get mast cell tumors and where?

Answer 20

dog - skin, always eosinophils

cat - SPLEEN

Question 21

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

Answer 21

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

Question 22

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

Answer 22

toluidin blue

Question 23

What is the most common neoplasia in animals?

Answer 23

lymphosarcoma

Question 24

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

Answer 24

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

Question 25

How much of hemopoietic tumors do lymphosarcomas cause in cats?

Answer 25

90%

Question 26

What are lymphosarcomas caused by in cats?

Answer 26

FeLV

Question 27

What form of lymphosarcomas do cats not get?

Answer 27

cutaneous

Question 28

What are the 3 forms of sporadic lymphosarcomas in cattle?

Answer 28

calf, thymic, skin

Question 29

What is the adult form of lymphosarcoma in cattle?

Answer 29

enzootic leukosis - BLV

Question 30

What are the 3 forms of plasma cell tumors?

Answer 30

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

Question 31

What species get hamangiosarcomas and where?

Answer 31

dog - common, spleen | cat - liver

Question 32

What are the clinical signs of hemangiosarcoma

Answer 32

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

Question 33

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

Answer 33

2 anterior ones

Question 34

What is a clinical sign of adenocarcinoma?

Answer 34

hypercalcemia (PTH like substance)

Question 35

What describes a "peri anal" gland tumor?

Answer 35

dogs - hepatoid looking

Question 36

What are seminomas associated with?

Answer 36

dog - cryptorchidism

Question 37

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

Answer 37

old dog - rosettes around vessels

Question 38

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

Answer 38

dogs - feminization

Question 39

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

Answer 39

granuloma cell tumor | cow/horse - nymphomania, masculinization

Question 40

Which species get uterus adenomas?

Answer 40

rabbit, cow