肩峰下滑液包内に発生した pseudomalignant osseous tumor の 1 例

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There were several diseases which caused osseous tumor in the joints or near the joints, for example synovial osteochondro-matosis, calcification tenditis, secondary osteochondroma and pseudomalignant osseous tumor. Pseudomalignant osseous tumor is a rela1 case tively rare disease. Most patients were in their second or 3rd decades of life at the time of the appearance of tumor. Most tumors were sited in the extremities. The reports of this disease were scattered, but there was no report of a case occurring in the subacromial bursa. Recently we experienced of pseudomalignant osseous tumor developing in the subacromial bursa. The patient was a 19-year old man who complained of left shoulder pain and limitation of left shoulder joint motion without any history of trauma. Roentgenograms showed a calcified mass supero-lateral of the coracoid process. The size of mass was 2 centimeters in diameter. Computed tomographies and magnetic resonance images revealed periphery calcification. He was treated with a surgical procedure that consisted of removal of the mass. Histological examinations showed circumscribed surrounding tissues, mature trabecular bone forms at the periphery and spicules of osteoid tissue radiated towards the center of the tumor. It was called zone phenomena which was particular to pseudomalignant osseous tumor. Pseudomalignant osseous tumor occurs without an apparent cause and rapidly grew with inflammatory findings. Because of the histological features, this disease sometimes might be misdiagnosed as osteosarcoma. So we concluded that careful histological study, supported by clinical and radiological findings, is important in order to arrive at a correct diagnosis and prevent misinterpreting it as malignant tumor.
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肩峰下滑液包内に発生した pseudomalignant osseous tumor の 1 例

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