Open quiz solution: Case report 776

CMF is a rare neoplasm of bone, comprising less than 1% of primary bone tumors. The neoplasm was first described in 1948 by Jaffe and Lichtenstein as a separate entity from chondrosarcomas, having slightly different plain film characteristics and a benign clinical course. As of 1985, Kreicbergs, Lonnquist, and Willems estimated that approximately 400 cases have been published. Recently, we encountered a CMF with an unusual clinical presentation. The efficacy of MRI studies is shown.