Ceruminous gland adenocarcinoma in a dog: A case report

Abstract

Ceruminous gland adenocarcinoma is a malignant neoplasm of the external auditory canal in canine species, described in breeds such as German Shepherd Dog and Cocker Spaniel. It is less common than benign tumors and has a low rate of metastasis. It may be related to the presence of chronic otitis. This paper describes the clinical case of an eight-year-old poodle, from the El Bagre gold mining area (Colombia), with a history of exposure to mercury vapor, the presence of a nodule in the external auditory canal, histopathological diagnosis of ceruminous gland adenocarcinoma, and its correlation with exposure to mercury. The patient presented with chronic otitis that was treated with gentamicin, polymyxin B, and betamethasone, without positive evolution. A nodular structure of 1 cm in diameter was detected in the ventral portion of the external auditory canal of the left ear, with secondary external otitis due to <em>Staphylococcus aureus</em>. The mass was excised and sent to histopathology, and ceruminous gland adenocarcinoma was reported. Antineoplastic therapy was not performed, but the patient evolved positively after surgical extraction, without recurrence for 24 months