Metastatic follicular variant of papillary thyroid carcinoma manifested asa primary renal neoplasm

Although autopsies performed on patients with cancer have shown 4.6 to 7.6% of metastases to the kidneys, the preoperative clinical identification rem ains rare. The primary sources of metastases to the kidney are in decreasin g order of frequency: breast, lung, intestine, contralateral kidney, stomac h, ovary, cervix, pancreas, uterus, and prostate. As far as we know, only s even cases of malignant neoplasms of the thyroid gland metastatic to the ki dney have been reported [1]. Herein, we report the eighth case of this even t and the second of a follicular variant of papillary thyroid carcinoma who se initial manifestation was hematuria and flank pain.