This spontaneous, locally invasive, fibroblastic skin tumor
is the most common tumor on the horse.
T/F: Sarcoids are usually metastatic tumors
What is the etiology of equine sarcoids?
Bovine Papilloma Virus (BPV)
What do you expect to see on histology of a sarcoid lesion?
Irregularly arranged fibroblasts (WHORLS)
NO invasion of underlying muscle
This treatment for Sarcoids has a success rate of 96%
Which chemotherapeutical agent is used to treat sarcoids and
hows is it given?
Cisplatin- 4 intratumoral injections 2 weeks apart
What is the treatment of choice for sarcoids that are disseminated throughout the body?
BCG (Bacillus-Calmette-Guerrin) Immunotherapy
What are the types of sarcoids?
Fibroblastic (proud-flesh like)
Occult (slightly raised)
Sarcoids can regress on their own if they are small enough
What are 5 differentials that should be on your list if you suspect sarcoids?
Exuberent granulation tissue
Dermatophytosis (resembles verrucous sarcoids)
What are the 6 ways you can treat sarcoids?
___________ are tumors that arise from the malignant transformation of
This is the SECOND most common tumor in horses
What type of horses are melanomas most commonly seen in?
GRAY horses, OLD horses
What are the types of melanomas?
What are the most common locations to see melanomas?
Perineal region (most common)
Melanomas found growing on intestines can cause colic
Melanomas DO NOT grow on intestines,
but they CAN cause colic (especially if in the perineal region and ulcerate)
How is diagnosis of melanoma confirmed?
What are the most common areas to see sarcoids?
Head, legs, ventral abdomen
What type of surgery is indicated for a melanoma in the eyelid region?
Sliding Flap Technique
(with creation of Burow's triangles)
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)
T/F: Melanomas in the perineal region must be surgically resected
FALSE! Cannot do surgery on the perineal area
This medication is used systemically as a non-specific treatment for melanomas.
It is an H2-receptor antagonist that blocks pigment synthesis
What is the arrow pointing to?
What is your diagnosis upon seeing this on histopathology
of a mass removed from the perineal area of a gray horse?
What is your most likely diagnosis?
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?
Classify this sarcoid, found cranial and medial to this horse's eye.
This is seen on histology of a mass removed from the
ventral abdomen of a horse. What is your primary ddx and why?
Can see the epidermal component with epithelial pegs extending deep into the
Healing of cryosurgical sites is always by__________