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A case is presented of synovial chondromatosis within a bursal sac overlying an osteochondroma in a patient with osteochondromatosis. This condition presented with a symptomatic soft tissue mass containing calcified bodies. It can be mistaken clinically and radiographically for malignant degeneration of an osteochondroma with development of chondrosarcoma. Magnetic resonance findings have not previously been described in this entity and proved helpful in the preoperative diagnosis. Magnetic resonance imaging was also helpful in defining the extent of the lesion. Ultrasound and other imaging modalities are also discussed, including the pathologic basis for the radiographic findings.

Cystic hygromas arising outside of the cervicofacial, thoracic, and abdominal areas are extremely rare. Detailed descriptions of this lesions along with its MRI findings, in the extremities are lacking in the literature. The following case report describes such a lesion occurring in the arm.