THYMOMA IN 2 FERRETS

A cranial mediastinal mass was observed radiographically in two 5-year -old adult male ferrets (Mustela putorius furo), both with histories o f chronic episodic vomiting, dyspnea, and lethargy. Malignant lymphoma , a common neoplasm observed in ferrets, was considered the most likel y diagnosis. Cardiomegaly and splenomegaly were also present. Histolog ically both mediastinal masses were composed of thymic epithelial cell s and small lymphocytes, establishing a diagnosis of thymoma. Thymoma should now be included in the differential diagnosis of a cranial medi astinal mass in ferrets.