Leiomyoma of the Uterus in a False Killer Whale

Abstract

A case of uterine leiomyoma in a false killer whale was studied. At necropsy, an approximately 15cm tumor nodule was observed in the right uterus horn, and was diagnosed as leiomyoma by light microscopy. The present case might be the first reported case of leiomyoma in small cetaceans kept in aquariums in Japan.