Hepatic myelolipomas in a cat.

A 16-year-old spayed domestic cat was determined to have hepatic myelolipoma. Treatment consisted of incomplete surgical removal. Despite some tumor tissue remaining, the cat did well for 2 years, then died of an undiagnosed illness. Myelolipomas are tumors of extramedullary hematopoietic tissue, and have been reported uncommonly in cats. On the basis of the clinical course in people, myelolipomas were assumed to be benign in cats. The extended survival after incomplete surgical excision of the tumor in our cat supports this assumption.