A 52-year-old woman presented to her orthopedic surgeon approximately five years after the onset of appearance of a right thigh mass which was at this point so large that it interfered with ambulation. A three-phase bone scan revealed a hypervascular mass with intense uptake in the calcified portion of the tumor and noninyolvement of the right femur. Surgical pathology was consistent with a monophasic synovial cell sarcoma. Synoyial cell sarcomas are uncommon malignancies. They arise from cells associated with the articular synovium or from those associated with the tendon sheath. Thirty percent show calcification on plain films. Many patients have distant metastases at the time of diagnosis. Synovial cell sarcoma should be included in the long list of soft tissue lesions that accumulate bone-scanning agents.
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