[Primary clear cell carcinoma of the thyroid--case report]

We present a case of a 59-year old woman in whom incidentally a thyroid nodule of 10 mm diameter was discovered. A fine needle aspiration biopsy was performed and it revealed follicular tumour. The patient was referred to surgery and she had a subtotal thyreoidectomy performed with a part of the left lobe spared. The histopathological examination of the nodule led to a different diagnosis. The diagnosis was clear cell carcinoma in the thyroid, probably metastatic, the most probable primary site being the kidney. A computed tomography scan of the kidneys and abdomen was performed but it revealed no changes. The patient has been seen for a year in follow-up, with CT scans performed every six months that revealed no changes. The patient has been in good condition during the whole period of observation.

We describe an extremely rare case of a primary thyroid clear cell carcinoma.