Renal metastasis from a carcinoma of the thyroid. A case report.

The authors report a case of renal metastasis from a thyroid adenocarcinoma in a 56-year-old man, occurring 3 years after isthmolobectomy for papillar y thyroid carcioma, He predominant clinical symptoms were low back pain, ha ematuria and deterioration of the general state. Ultrasonography showed a h ypoechoic 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 s urgical procedure consisted of radical nephrectomy. Macroscopic examination of the lesion showed a cystic mass. Histological examination of the mass r evealed a renal metastasis from moderately differentiated thyroid adenocarc inoma.