Pelvic lipomatosis associated with proliferative cystitis occurring in two brothers.

Pelvic lipomatosis is a rare disorder of benign mature adipose tissue proliferation around the bladder and rectum. Most cases are associated with proliferative cystitis, in particular, cystitis glandularis. The etiology of pelvic lipomatosis and its association with proliferative cystitis are not well understood. This is the first reported case of familial pelvic lipomatosis. The pathogenesis and the possibility that this disorder could be secondary to genetic abnormalities of the HMG-IC (high mobility group) gene on chromosome 12 are discussed.