Presence of mastocytoma in auricular pavilion in a canine

Cutaneous and subcutaneous mast cells tumor are neoplasms composed of mast cells that are part of the skin in canines. It is a very common tumor and the treatment is focused on the aggressiveness that it may present. Sometimes it can be limited to local treatment, but if there are metastases, the prognosis can be favorable. Tumor staging is of great importance to give a diagnosis, treatment and prognosis for those patients affected by this pathology. In this work, we present the clinical case of an 11-year-old German shepherd canine with the presence of an ulcerated mass in the right auricle. The diagnosis was made by cytology and histopathology of canine mastocytoma grade II and low malignancy according to Pakiel's classification. The patient underwent a partial resection of the auricle with the presence of clean borders in the histopathological results. This is the first report of the presence of canine mastocytoma in the pinna in a canine.