Unusual Scintigraphic Findings of Synovial Sarcoma Metastases

Abstract

Synovial cell sarcoma, which accounts for much less than 1% of all malignancies, arises from the cells associated with the synovium or the tendon sheath, bursa, or external capsule of the joint. The extremities' periarticular regions are commonly the primary site (94%). Synovial cell sarcoma affects young adults (mean age = 30) and usually spreads by the hematogenous route, while lymphatic spread is uncommon. At the time of initial diagnosis, the vast majority has no detectable distant metastases. However, if metastasis is present, 75% would develop in the lungs, 15% in the regional lymph nodes, 10% in bones. Metastases can appear as calcified nodules in 30–50% of cases. This case presents an unusual appearance of calcification in the right lower abdominal metastatic focus. In addition, calcification of the larger pulmonary metastatic foci were also visualized.