Metastases to the thyroid gland are rare. We report the case of a 50-year-old man with an isolated thyroid metastasis from renal cell carcinoma (RCC), 3 years after radical nephrectomy for the primary disease. Although uncommon, if a patient with a previous history of malignancy has a new thyroid mass, it should be considered metastatic tumor of recurrent malignancy until proved otherwise.
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