Thyroid carcinoma comprises 1% of all malignancies. It is the commonest malignant endocrine tumour1. Most thyroid carcinomas arise from the follicular epithelium and are differentiated carcinomas.
The two main groups are papillary (80%) and follicular (10-15%)2. Follicular carcinoma has a predilection for spreading via the bloodstream early, and metastasis is most commonly to the lung and bone1. So far only about 20 cases of differentiated thyroid carcinoma metastasising to the kidney have been reported. We report a rare case of follicular thyroid carcinoma metastasising to the kidney.