Metastases of non-thyroid malignancies to the thyroid gland have been reported in 1.4% to 3% of patients undergoing thyroid surgery for thyroid malignancy. We report a case of thyroid metastases from renal cell carcinoma in a 57-year-old man, who underwent a left nephrectomy 11 years earlier for a renal cell carcinoma. The histological examination demonstrated a CD-10 positive and thyroglobulin and thyroid transcription factor-1 negative tissue, with numerous noncaseating gigantocellular granulomas. These findings are interesting for the possible role of the immune response in metastatic localizations.
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