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Synovial sarcoma of the prostate.

Synovial sarcoma is a mesenchymal neoplasm that typically arises in the para-articular soft tissues of the lower extremities in young adults. While it has been described in a variety of sites including the parapharyngeal space, abdominal wall and retroperitoneum, involvement in the genitourinary tract is exceedingly rare. We report a case of synovial sarcoma of prostatic origin that invaded the cavernous bodies.