両側腎細胞癌術後に甲状腺転移をきたした１例

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  • A Case of Thyroid Metastasis from Renal Cell Carcinoma.

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We recently encountered a rare case of thyroid metastasis from renal cell carcinoma. A 74-year-old man underwent left radical nephrectomy for renal cancer in 1984, and tumor resections for right renal cancers in 1997 and 1998. An asymptomatic mass in the right lobe of the thyroid was revealed by computed tomography and ultrasonography in March 2000. Because the lesion was strongly suspected as metastasis from renal cancer following aspiration cytology, a right thyroidectomy was performed in July 2000. The histopathological examination confirmed the resected tumor was derived from renal cell carcinoma. The histological appearances were essentially the same in all the surgical specimens, suggesting that the primary renal cancer in the left kidney metachronously metastasized to the contralateral kidney and the thyroid. By reviewing the previous reports, left renal cancer is more likely to metastasize to the thyroid just as in the present case, probably via the pathway of the paravertebral plexus connected with the left renal vein.

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