Abstract
We experienced a patient with synovial osteochondromatosis in the hip joint.The case was a 29-year-old woman who has been suffering from coxalgia and limited hip motion, especially flexion and internal rotation since she was 26. Roentgenograms showed a calcified mass in the right hip joint. Arthrography showed a large mass in the right hip joint cavity. CT-scan showed the mass size to be 4×3×2cm. Gdenhanced MRI with fat suppression showed enhanced hypertrophic synovium and no enhanced nodular lesion. We suspected synovial osteochondromatosis, osteochondritis dissecans, or chondrosarcoma. We performed synovectomy, and found only one large mass in the hip joint. There was no nodular lesion within the synovium. Microscopic examination revealed a cartilaginous mass with calcification in the central portions and surface layering of synovium. The case was therefore diagnosed as synovial osteochondromatosis of the hip joint.
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