Squamous cell carcinoma is a common cancer (tumor) of the sheath and penis in middle-aged and older horses. Other tumors can appear in this area, but they are far less common.
Squamous cell carcinoma appears as variably sized raised pink to red, warty to ulcerated areas on pink skin. It varies from slow to rapid growing. Each cancer is specific in terms of its aggression (malignancy).
This condition is is far more common on unpigmented skin of the sheath and penis. It is also much more common in horses living at high altitudes, in arid regions with intense UV light.
I practice in New Mexico at 2130 meters (7000 feet) elevation, and this condition is very common here. American Paints and Appaloosas are the breeds commonly affected. I have also seen this condition in Belgians, Pintos, Appaloosas, and individual Palominos.
Vets make presumptive diagnoses of this condition frequently, based on location and appearance of a growth on pink skin. Biopsy and microscopic examination by a pathologist may yield additional information that is helpful in recommending treatment options.
Prognosis & Relevant Factors
Prognosis depends on age, size, location and characteristics of the mass, and biopsy results. Recurrence in the same place or other places is common. Prognosis is fair good if diagnosed and treated early.
I Might ObserveRelated Observations
Skills I might need
QUESTIONS TO ASK MY VET