ASPIRATION CYTOLOGY OF BIPHASIC AND MONOPHASIC SYNOVIAL SARCOMA - A REPORT OF 2 CASES

Two cases of synovial sarcoma diagnosed by aspiration cytology are des cribed. A 15-year-old, athletic female presented with a tender midthig h mass clinically thought to be a hematoma. Aspiration cytology reveal ed nu-merous clusters of spindle cells admixed with small groups of ep ithelial cells. Cytokeratin and vimentin stains were positive in the e pithelial and spindle components, respectively. Resection of the mass revealed a bi-phasic synovial sarcoma. Second, a 53-year-old male pres ented with a recurrent soft tissue mass 10 years after synovial sarcom a of the knee had been resected. Aspiration cytology revealed neoplast ic spindle cells. Cytokeratin and vimentin preparations showed focal p ositivity. Resection revealed a predominantly monophasic synovial sarc oma. These cases demonstrate the utility of aspiration cytology in dia gnosing both unsuspected and recurrent synovial sarcoma.