Apocrine sweat gland ductal carcinoma in a 5-year-old Arabian stallion

Abstract

Apocrine sweat gland carcinomas are very rare skin tumors in horses. A 5-year-old Arabian stallion was presented with a mass in the pastern region of the left forelimb. Grossly, a hairless and ulcerative mass measuring approximately 1 × 1 cm was noted. Complete surgical excision with wide, clean margins was selected as a method of treatment. Histopathological examination of the excised mass identified the apocrine sweat gland ductal carcinoma. There was no evidence of local tumor recurrence during the subsequent follow-up evaluations.