Metastatic clear cell renal cell carcinoma to the thyroid gland: A clinico-pathological and immunohistochemical study of 8 cases and review of the literature.

When a patient with a previous history of neoplasm presents with a thyroid lesion, the possibility of it being metastatic should always be considered. In this series, we present the clinicopathological and immunohistochemical features of the thyroid metastases diagnosed in our department over the past 30 years. Here we present eight thyroidal metastases from clear cell renal cell carcinoma (ccRCCC), including a tumor to tumor metastasis, the patients being 2 men and 6 women with a median age of 62 years.