[A case of retroperitoneal pleomorphic lipoma]

A 71-year-old male patient was referred to our department for further examination for right retroperitoneal tumor. Exploration was done through a flank approach and the tumor with right adrenal gland was removed. A pleomorphic lipoma was diagnosed histopathologically. There have been 8 reported cases of pleomorphic lipoma including our present case in Japan and we discuss the pathogenesis and treatment of this rare disease.