Radiotherapy in the management of recurrent synovial chondromatosis.

Synovial chondromatosis is a rare, benign condition characterized by the formation of multiple cartilaginous nodules that are generally intra-articular and can lead to chronic pain and limit the function of involved joints. We report on the novel use of radiotherapy that was used to treat a 42-year-old man with rapid recurrences of extensive synovial chondromatosis in the knee refractory to multiple operations. Based on follow-up MRI scans and clinical findings, the disease process was halted with no progression seen over 5 years.