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Multiple enchondromas may be encountered in association with either enchondromatosis (Ollier’s disease) or Maffucci’s syndrome (1-4). Although the phalanges and the metacarpals are the common sites of involvement in multiple enchondromas, secondary chondrosarcoma of the hand and feet associated with enchondromatosis is extremely rare (1, 2, 4). On the other hand, chondrosarcoma is a relatively common malignant bone lesion comprising approximately 10% to 12% of all malignant bone tumors; whereas, periosteal chondrosarcoma is a rare disease (2, 5). Concurrent intramedullary and periosteal chondroid tumor in the same bone is a diagnostic challenge (6). A series of case reports on enchondromatosis provides little information on the spectrum of MR imaging findings (1, 3). Herein, we reported a case of multiple enchondromas in a variety of locations and associated concurrent intramedullary and periosteal low grade chondrosarcomas in the lower extremities on MR imaging.

MR Features of Multiple Enchondromas with Associated Chondrosarcoma in the Lower Extremities