Exam 2: Equine Sarcoids and Melanoma Flashcards Preview

RUSVM LASx PRACTICE QUESTIONS > Exam 2: Equine Sarcoids and Melanoma > Flashcards

Flashcards in Exam 2: Equine Sarcoids and Melanoma Deck (37)
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1

This spontaneous, locally invasive, fibroblastic skin tumor

is the most common tumor on the horse.

Sarcoids

2

T/F: Sarcoids are usually metastatic tumors

FALSE

3

What is the etiology of equine sarcoids?

Bovine Papilloma Virus (BPV)

4

What do you expect to see on histology of a sarcoid lesion?

Hyperplastic/keratotic epidermis

RETE-PEG formation

Irregularly arranged fibroblasts (WHORLS)

NO invasion of underlying muscle

5

This treatment for Sarcoids has a success rate of 96% 

Chemotherapy

6

Which chemotherapeutical agent is used to treat sarcoids and

hows is it given?

Cisplatin- 4 intratumoral injections 2 weeks apart

7

What is the treatment of choice for sarcoids that are disseminated throughout the body?

BCG (Bacillus-Calmette-Guerrin) Immunotherapy

8

What are the types of sarcoids?

Fibroblastic (proud-flesh like)

Verrucous (wart-like)

Occult (slightly raised)

9

T/F:

Sarcoids can regress on their own if they are small enough

TRUE

10

What are 5 differentials that should be on your list if you suspect sarcoids?

Exuberent granulation tissue

Fibrosarcoma

Cutaneous habronemiasis

SCC

Dermatophytosis (resembles verrucous sarcoids)

11

What are the 6 ways you can treat sarcoids?

Spontaneous regression

Surgical excision

Cryosurgery

Radiation

Chemotherapy

BCG Immunotherapy

12

___________ are tumors that arise from the malignant transformation of

normal melanocytes

Melanomas

13

This is the SECOND most common tumor in horses

Melanomas

14

What type of horses are melanomas most commonly seen in?

GRAY horses, OLD horses

15

What are the types of melanomas?

Slow-growing

Benign

Malignant

Metastatic

16

What are the most common locations to see melanomas?

Perineal region (most common)

Ventral tail

Lips

17

T/F:

Melanomas found growing on intestines can cause colic

FALSE!

Melanomas DO NOT grow on intestines,

but they CAN cause colic (especially if in the perineal region and ulcerate)

18

How is diagnosis of melanoma confirmed?

Biopsy

19

What are the most common areas to see sarcoids?

Head, legs, ventral abdomen

20

What type of surgery is indicated for a melanoma in the eyelid region?

Sliding Flap Technique

(with creation of Burow's triangles)

21

For surgery in the eyelid region to remove a melanoma, 

the Sliding Flap Technique is used.

It is important to remember not to undermine > ______ cm;

any larger and the area with SLOUGH!

4 cm (2 inches)

22

T/F: Melanomas in the perineal region must be surgically resected

FALSE! Cannot do surgery on the perineal area

23

This medication is used systemically as a non-specific treatment for melanomas.

It is an H2-receptor antagonist that blocks pigment synthesis

CIMETIDINE

24

What is the arrow pointing to?

Burow's Triangles

25

What is your diagnosis upon seeing this on histopathology

of a mass removed from the perineal area of a gray horse?

Melanoma

26

What is your most likely diagnosis?

Melanoma

27

This mass was seen on the leg of a horse. It is mushrooming in appearance

with an ulcerated surface that bleeds easily. 

 

What is your primary ddx?

FIBROBLASTIC SARCOID

28

Classify this sarcoid, found cranial and medial to this horse's eye.

OCCULT sarcoid

29

This is seen on histology of a mass removed from the

ventral abdomen of a horse. What is your primary ddx and why?

SARCOID!

Can see the epidermal component with epithelial pegs extending deep into the

underlying tissue

30

Healing of cryosurgical sites is always by__________

2nd intention