Alimentary lymphoma in a northern fur seal Callorhinus ursinus

Abstract

We report a case of alimentary lymphoma in a northern fur seal kept in Izu Mito Sea Paradise. At necropsy, a perforatedulcer approximately 7 cm in diameter and 3 cm deep was observed on the mucous of bottom of the stomach. The thick end of the stomach wall around the ulcer was diagnosed histopathologically as lymphoma. This case is the first supposed case of alimentary lymphoma in the northern fur seal.