Fine needle aspiration cytology of biphasic synovial sarcoma of soft tissue. Report of a case with ultrastructural, immunohistologic and cytophotometric studies.

A case of biphasic synovial sarcoma initially diagnosed by fine needle aspiration cytology is described. The diagnosis was confirmed by electron microscopic studies on a repeat aspirate and histologic and immunohistochemical studies on the surgical specimen. The cellular DNA content was also measured. The differential diagnosis and histogenesis of this neoplasm are discussed.