Intraosseous lipoma is an extremely rare tumor in bone. Since the original report of case by Brault, 29 authentic cases of intraosseous lipoma have been reported to the end of 1973. In Korea, even a single case of intraosseous lipoma was not reported. Because ·of the rarity,3 report is presented of a patient who underwent operation with a diagnosis of fibrous dysplasia of fibula; the postoperative pathologic study showed lipoma of bone.