Thyroid Metastasis as the First Manifestation of Renal Clear Cell Cancer

Thyroid metastases from extra-thyroid primary tumours are reported to be rare, mostly originating from lung, breast or renal cancer. Renal clear cell cancer (RCCC) is a tumour with great metastatic potential, but solitary metastases, especially in the thyroid gland, are uncommon. Here we report an unusual clinical case. In our patient, metastatic thyroid lesion was diagnosed before the primary RCCC. Surgical treatment yielded cancer-free survival, at present lasting already for 1.5 years.