Cutaneous junctional melanocytoma in a dog: Clinical, cytological, histopathological and immunohistochemical evaluation

Abstract

A 4-year-old Rottweiler dog had a black, firm nodule  noticed in the dorsal aspect of a paw region in the periungual region at the nail bed/nail fold area of the paw. Cytology revealed brownish-black pigments dispersed throughout the cytoplasm and histopathology revealed melanocytic cells extending from the dermo-epidermal junction into the deep dermis with melanin granules. Immunohistochemistry confirmed strong Melan-A expression.