Case report 821: Parosteal ossifying lipoma of femur.

Parosteal lipoma with bony excrescences at the periosteal base of the tumor is rare. Only one case has been reported with osseous and cartilaginous nodules throughout the lipoma. We describe an additional case in a 39-year-old man. We emphasize the characteristic radiological appearance of the lesion as well as the possibility of a dual histogenesis for the osteochondromatous component. We also stress the great value of CT in establishing the diagnosis.