title: Malignant perianal melanoma in a horse.
mesh_terms: D000818:Animals; D001005:Anus Neoplasms / Q000473:pathology / Q000662:veterinary*; D006734:Horse Diseases / Q000473:pathology*; D006736:Horses; D008545:Melanoma / Q000473:pathology / Q000662:veterinary*