Abstract
SummaryA 13‐year‐old Swedish Warmblood mare was presented for evaluation of a mass on the medial aspect of the left vertical ear canal. The mass was initially resected using monopolar loop diathermy. Histopathological diagnosis of the excisional biopsy was a low‐grade malignant ceruminous adenocarcinoma. The clinical and histopathological features of this previously unreported neoplasm in the horse are described. A modified vertical ear canal ablation was performed in order to remove the base of the neoplasm with adequate free margins. The surgical technique is described. No recurrence was noted 2 years after surgery and the appearance and function of the pinna were retained.
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