Hemimandibulectomy for treatment of an ameloblastoma in a 13-year- old Holsteiner gelding

This case report describes the treatment and outcome of a 13-year-old Holsteiner gelding presented to the Equine Hospital, University of Zurich, because of a rapidly growing ameloblastoma located in the rostral aspect of the left mandible. Radiography and computed tomography were used to localise the tumour and plan the surgery. The tumour was removed via hemimandibulectomy, and at the six-month follow-up, signs of recurrence were not evident. However, mild tongue protrusion was observed as a side effect of incisor removal. Histological evaluation of the tumour confirmed ameloblastoma in agreement with the initial biopsy diagnosis. Ameloblastoma is rare in horses and the prognosis is good, provided that complete surgical resection can be achieved.