Synovial sarcoma is a rare malignant neoplasm of the soft tissue arising in the lower extremity, inguinal area, and upper arm. The majority occurs in patients between the age of 15 and 40 years, The histologic diagnosis based on the
classical
biphasic type with the distinct epithelial and spindle cell components.
We have recently encountered a case of metastatic synovial sarcoma of the lung diagnosed by fine needle aspiration cytology. A 34-year-old man was admitted because of a palpable mass on the antero-lateral side of the right tibia for
3
years. On admission, a well demarcated metastatic pulmonary nodule. measuring 5cm in diameter, was also identified in the simple chest X-ray.
Resection of the lower leg mass revealed typical histologic features of biphasic synovial sarcoma. Aspiration cytology of the pulmonary nodule revealed numerous clusters of spindle cells admixed with groups of epithelial cells. The
epithelial
cells had moderate-sized, round to oval shaped, and hyperchromatic nuclei. The cytoplasm was clear. but not distinctive. Interspersed cell elements were fibroblast-like spindle cells having elongated hyperchromatic nuclei.
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