title: Case report: metastatic renal carcinoid to the thyroid diagnosed by fine needle aspiration biopsy.
abstract: We report a case of primary renal carcinoid arising in a horseshoe kidney. To the best of our knowledge this is the first case to be reported in the cytology literature, which has been diagnosed by fine needle aspiration (FNA). A 32-year-old male, presented to the Emory University Hospital, with a renal mass arising in a horseshoe kidney; along with a thyroid mass. FNA of the renal mass resulted in an initial diagnosis of renal cell carcinoma, unclassified. A thyroid aspiration was attempted later, and revealed a neuroendocrine morphology. This was compared with the renal aspiration and both of them were found to have similar morphology. With the help of immunostains, a diagnosis of renal carcinoid tumor metastatic to the thyroid was made. Thus, we demonstrate that renal carcinoid, being a rare entity, can pose a diagnostic challenge.
authors: Department of Pathology and Laboratory Medicine, Emory University Hospital, School of Medicine, Atlanta, Georgia 30322, USA.
authors: Ritu
authors: R
authors: Bhalla
authors: Aimee
authors: A
authors: Popp
authors: Aziza
authors: A
authors: Nassar
mesh_terms: D000328:Adult; D044963:Biopsy, Fine-Needle / Q000379:methods; D002292:Carcinoma, Renal Cell / Q000473:pathology / Q000556:secondary*; D006801:Humans; D007668:Kidney / Q000002:abnormalities*; D007680:Kidney Neoplasms / Q000473:pathology*; D008297:Male; D009362:Neoplasm Metastasis; D013964:Thyroid Neoplasms / Q000473:pathology / Q000556:secondary*