Chondromyxoid fibroma.

Chondromyxoid fibroma (CMF) is the least common cartilage-producing tumor. In Dahlin and Unni's series of 8,542 bone tumors, 39 of which were CMF, none were found in the femoral shaft. In this case, a CMF in the femoral shaft presented initially as a pathologic fracture. Attempts at curettage and autogenous bone graft failed, and en bloc resection and segmented allograft reconstruction were eventually required.