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Abstract  In the thyroid gland, both squamous cell carcinoma and intrathyroidal epithelial thymoma are rare tumors with squamous features,
but their prognoses differ; the former is usually fatal, and the latter is favorable. We describe a 38-yr-old female patient
with a cystic tumor diagnosed cytologically as squamous cell carcinoma, who was treated with subtotal thyroidectomy. The tumor
was located intrathyroidally in the middle third of the left lobe, and no invasion to the surrounding tissues was found. Histologic