SYNOVIAL CHONDROMATOSIS SIMULATING NEOPLASTIC DEGENERATION OF OSTEOCHONDROMA - FINDINGS ON MRI AND CT

A case is presented of synovial chondromatosis within a bursal sac ove rlying an osteochondroma in a patient with osteochondromatosis. This c ondition presented with a symptomatic soft tissue mass containing calc ified bodies. It can be mistaken clinically and radiographically for m alignant degeneration of an osteocondroma with development of chondros arcoma. Magnetic resonance findings have not previously been described in this entity and proved helpful in the preoperative diagnosis. Magn etic resonance imaging was also helpful in defining the extent of the lesion. Ultrasound and other imaging modalities are also discussed, in cluding the pathologic basis for the radiographic findings.