title: Tumor-to-tumor metastasis: Renal cell carcinoma metastatic to papillary carcinoma of thyroid-report of a case and review of the literature.
abstract: Metastatic disease to thyroid gland is a rare event. Although renal cell carcinoma (RCC) has been reported to metastasize the thyroid gland, metastatic RCC to a thyroid neoplasm is very unusual. We report a case of a 68-year-old man with history of RCC who presented with a 2.5-cm thyroid nodule. Histologic examination demonstrates a renal cell carcinoma metastatic to a papillary carcinoma of the thyroid. The clinicopathologic features of metastatic disease into a thyroid gland neoplasm are shown, and a review of the literature is presented.
authors.affiliation: Department of Pathology, MetroHealth Medical Center-Case Western Reserve University, Cleveland, OH 44109, USA.
authors.forename: Olga L
authors.initials: OL
authors.lastname: Bohn
authors.forename: Luis E
authors.initials: LE
authors.lastname: De las Casas
authors.forename: Marino E
authors.initials: ME
authors.lastname: Leon
mesh_terms: D000231:Adenocarcinoma, Papillary / Q000473:pathology* / Q000601:surgery; D000368:Aged; D002292:Carcinoma, Renal Cell / Q000556:secondary*; D006801:Humans; D007150:Immunohistochemistry; D007680:Kidney Neoplasms / Q000473:pathology*; D008297:Male; D013964:Thyroid Neoplasms / Q000473:pathology* / Q000601:surgery; D013965:Thyroidectomy