Squamous cell carcinoma (SCC) is the most common neoplasm of the equine eye and ocular adnexa and the second-most-common tumor in horses overall.15 Horses older than 10 years of age seem to be most predisposed, with Belgians, Clydesdales and other draft horses experiencing the highest prevalence, followed by Appaloosas and paints. Arabians, thoroughbreds and quarter horses have the lowest prevalence of SCC. Horses with less skin-coat pigment—white, grey and palomino hair coats—also have a greater prevalence of periocular SCC (PSCC). Lower prevalence occurs in horses with bay, brown or black hair coats.
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