Tumors of the Skin Flashcards

1
Q

Malignant neoplasm of keratinocytes that is locally invasive and slow to metastasize and assoc. w/chronic sun exposure

A

SCC

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2
Q

Where do skin SCCs usually occur in cats?

A

Head

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3
Q

If an SCC is found on a cat’s digit, what is the next step?

A

Thoracic rads b/c SCC in cats may be 2* to pulmonary carcinoma

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4
Q

Where do skin SCCs usually occur in dogs?

A

Digit, trunk, limbs, scrotum

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5
Q

Benign tumor caused by infection of epithelial cells w/species-specific papillomaviruses

A

Papilloma

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6
Q

How is papillomavirus transmitted?

A

Direct and indirect contact

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7
Q

What is the incubation period of papillomavirus?

A

1-2mo

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8
Q

Which age of dogs are most commonly affected by papillomavirus?

A

Younger

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9
Q

How soon do most papillomas regress?

A

3mo

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10
Q

How do papillomas present?

A

Smooth white papules, plaques, or cauliflower lesions

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11
Q

What regions of the body are commonly affected by papillomas?

A

Nose, conjunctiva, and haired skin

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12
Q

What is the origin of a lipoma?

A

Adipocyte

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13
Q

Are lipomas malignant or benign?

A

Benign

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14
Q

Are lipomas more common in dogs or cats?

A

Dogs

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15
Q

Where are lipomas most often found on the body?

A

Thorax, abdomen, proximal limbs

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16
Q

What do lipomas look like?

A

Soft, dome-like mass, can be pedunculated

17
Q

Are sebaceous gland tumors more common in dogs or cats?

A

Dogs

18
Q

What do sebaceous gland tumors look like?

A

Nodular, solitary, wart-like

19
Q

Malignant tumor of dermal mast cells

A

Mast cell tumor

20
Q

What is the pathogenesis of a mast cell tumor?

A

P53 and c-KIT mutation

21
Q

Why might an MCT dog also have a coagulopathy?

A

Heparin in the mast cells

22
Q

Reactive hyperplasia that originates from langerhans cells

A

Cutaneous histiocytoma

23
Q

Single well circumscribed mass on the head, pinnae, or limbs of a young dog

A

Cutaneous histiocytoma

24
Q

How do you treat a cutaneous histiocytoma?

A

None - spontaneously regress in 3mo

25
Q

Are fibrosarcomas more common in dogs or cats?

A

Cats

26
Q

What do fibrosarcomas originate from?

A

Dermal/subcutaneous fibroblasts

27
Q

Which vaccines are most often assoc. w/fibrosarcomas?

A

Rabies and FeLV

28
Q

Are basal cell tumors more common in dogs or cats?

A

Cats

29
Q

Are basal cell tumors more often benign or malignant?

A

Usually benign

30
Q

Large dog presenting with a “skin tag” after trauma likely has what type of skin tumor?

A

Fibrovascular papilloma

31
Q

Firm pedunculated growths commonly found on bony prominences, sternum, and trunk of dogs

A

Fibrovascular papilloma