Clear-cell renal cell carcinoma single thyroid metastasis: A single-center retrospective analysis and review of the literature.

Renal cell carcinoma (RCC) is known to cause metastasis to unusual sites, which can be both synchronous or metachronous. Thyroid gland is a rare site for metastasis. However, RCC is the most common primary neoplasm to metastasize to the Thyroid gland. Report of three cases and review of the literature.