Clinical data: a 73-year-old man with a nodule discovered incidentally by carotid Doppler examination.

A relatively firm nodule was palpable in the left lobe.

Functional state: euthyroidism (TSH-level 2.81 mIU/L).

Ultrasonography: a solitary hypoechogenic nodule in the left lobe.

Cytological report: Hürthle-cell tumor.

Histopathological diagnosis: Hürthle-cell variant of follicular cancer.