Lipoma of the urinary bladder in a cat

A 7-year-old male Persian cat was referred for necropsy examination a with history of progressive abdominal distention, dysuria, polyuria, colic and death. At necropsy examination, a raised white unencapsulated mass (3×6×4cm) was found on the mucosal surface of the bladder. The mass was lobulated with soft consistency similar to that of adipose tissue. Microscopical examination revealed cells identical to those of normal adipose tissue. On the basis of the gross and microscopical findings, the lesion was diagnosed as a lipoma. This tumour has not been recorded previously in the urinary bladder of a cat.