Abstract
Lymphoepithelioma-like carcinomas (LELC) occurring in sites derived from the primitive pharynx and foregut have been reported to show a strong association with Epstein-Barr virus (EBV), especially in the Oriental population. Primary lymphoepithelioma-like carcinoma of the thyroid is an extremely rare neoplasm which has been known under many different names, such as intrathyroidal epithelial thymoma, primary thyroid thymoma, carcinoma of the thyroid showing thymoma-like features, and carcinoma showing thymus-like differentiation (CASTLE). We report one such case in a Chinese woman, whose tumor was negative for EBV by in situ hybridization technique. This finding suggests that LELC of the thyroid may be biologically different from other LELCs, and that detection of EBV may aid in diagnosis when the LELC presents initially in lymph nodes or other metastatic sites.
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