Synovial sarcoma - biphasic subtype
Citation, DOI and case data
Painless swelling of the posterior aspect of the right thigh.
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There is an ovoid soft tissue mass of the posterior aspect of the right mid-thigh, of intramuscular location within the adductor magnus muscle measuring 67 x 58 x 46 mm. It elicits an iso-to high signal to the muscles on T1, heterogeneous high signal on T2/STIR with areas of fluid-fluid levels and thick, irregular septae of low signal. The postcontrast sequences show a peripheral irregular enhancement as well as the septae. No apparent extension to the adjacent muscles. Normal appearance of the femoral vessels and sciatic nerve.
The MRI features are suggestive of a malignant tumor of intramuscular location within the adductor magnus muscle, pathologically proven as a synovial sarcoma biphasic subtype.