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Figure 34a. Synovial chondromatosis in a 31-year-old woman who originally presented at age 28 years with right hip pain; the radiograph obtained then was normal. Synovial chondromatosis occasionally manifests without radiographic evidence of ossified bodies. (a) AP radiograph of the right hip shows multiple round bodies in the redundant portion of the hip joint around the femoral neck (arrows). This finding is diagnostic of synovial chondromatosis. (b) Coronal T2-weighted MR image shows an effusion with multiple loose bodies within it (arrow). (However, MR imaging is not needed to make the diagnosis.) It is worth remembering that in this disease process the bodies need not be seen, and indeed erosive change may be seen without radiographic evidence of bodies.