[Diagnosis, treatment and prognosis in cases of renal clear cell carcinoma metastases into the thyroid gland].

The most common metastatic tumour of the thyroid gland which is clinically revealed is renal clear cell carcinoma (RCCC). Our clinical experience in cases of RCCC metastases into thyroid gland is reviewed in terms of the history of the disease, obligatory diagnostic procedures, surgical management and outcome prognosis. We believe that all the patients with even a remote RCCC history require systematic follow-up including thyroid gland as metachronic metastatic disease can occur many years after primary surgery. Clinical diagnosis and ultrasound of the thyroid gland is essential in selection for surgical treatment. Confirmation of malignancy in FNA (fine needle aspiration) in often difficult regarding concomitant multinodular goitre. Enlargement of a single thyroid nodule except L-thyroxin therapy for 3-6 months is a sufficient indication for surgical treatment, not depending on FNA result, particularly when a suspected nodule becomes bigger than 30 mm in diameter.