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  • Title: Case report: metastatic renal carcinoid to the thyroid diagnosed by fine needle aspiration biopsy.
    Author: Bhalla R, Popp A, Nassar A.
    Journal: Diagn Cytopathol; 2007 Sep; 35(9):597-600. PubMed ID: 17703444.
    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.
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