Intramedullary lipoma of the distal femur.

A rare case of intramedullary lipoma involving the distal femur is presented and discussed in relation to previously reported cases. The 26 previously reported extracranial cases of this bone lesion are briefly reviewed. Emphasis is placed upon establishing a definitive pathologic diagnosis by open biopsy when one is dealing with a large bony lesion that has indefinite radiologic features.