Synovialhemangioma within the infrapatellar fat pad as cause for anterior knee pain.

An 18 years old man and his younger sister suffered from anterior knee pain . Cause is a soft tissue tumor located within Hoffa's fat pad however in bo th cases. The tumor has been excised and the histological examination demon strated the diagnosis synovial hemangioma. A literature search shows that s ynovial hemangiomas are rare soft tissue tumors. They mainly involve the kn ee joint. Mean age is the second decade of life and most authors observed s evere degenerative changes in the involved knee joint. There are no reports about familiar accumulation within the literature. Familiar accumulation o f synovial hemangiomas however have been described for cerebral, skin and h epatic manifestations but not for synovial hemangiomas.