INTRANEURAL BIPHASIC SYNOVIAL SARCOMA - AN ALTERNATIVE GLANDULAR TUMOR OF PERIPHERAL-NERVE

A primary intraneural biphasic synovial sarcoma that arose within the common digital nerve of the hand is reported. The patient, a 16-year-o ld girl, presented with a small soft tissue mass that clinically and i ntraoperatively resembled a nerve sheath tumor. The diagnosis of synov ial sarcoma was established on the basis of a typical light microscopi c appearance and immunohistochemical staining profile. Intraneural bip hasic synovial sarcoma resembles ''glandular'' peripheral nerve sheath tumor, because both are composed of a mixture of spindled mesenchymal cells with admired glandular epithelial elements. The features allowi ng differentiation of these two unusual tumors of peripheral nerve are discussed.