Synovial sarcoma of the thyroid. Report of a case with aspiration cytology findings and gene analysis.

Background: Synovial sarcoma, generally known as a soft tissue tumor, can also occur in the head and neck region, including the thyroid gland. Cytologic findings are important to differentiate the tumor from other types of neoplasms arising in the thyroid gland.

Case: A 60-year-old man complained of hoarseness.