Biphasic synovial sarcoma of the hypopharynx.

Synovial sarcoma is a malignant mesenchymal neoplasm usually involving the extremities of young adults. Localization in the head and neck region is rare. Histologically, these lesions have biphasic and monophasic variants, the latter being more rare and difficult to identify. Immunohistochemistry plays a crucial role in the diagnosis. We report a case of a biphasic synovial sarcoma arising in the hypopharynx with a review of the literature concerning this rare neoplasm.