[Thyroid cancer metastasizing to the kidney. Report of a case]

The authors report a case of renal metastasis from a thyroid adenocarcinoma in a 56-year-old man, occurring 3 years after isthmolobectomy for papillary thyroid carcinoma. He predominant clinical symptoms were low back pain, haematuria and deterioration of the general state. Ultrasonography showed a hypoechoic left renal mass, 56 mm in diameter, with a thickened wall. Renal CT showed a homogeneous low-density formation with a thickened wall in the left kidney. Iodine 131 whole body scan showed increased uptake in the left kidney. The patient wes treated surgically via a subcostal incision. The surgical procedure consisted of radical nephrectomy. Macroscopic examination of the lesion showed a cystic mass. Histological examination of the mass revealed a renal metastasis from moderately differentiated thyroid adenocarcinoma.