Clinical data: a 33-year-old woman with a goiter detected on a routine physical examination.

Palpation: a solitary nodule in the enlarged right lobe.

Functional state: euthyroidism with TSH-level 1.68 mIU/L.

Ultrasonography: a solitary hypoechogenic nodule in the right lobe with a halo sign and perinodular blood flow.

Cytological report: follicular tumor.

Suggestion: surgery.

Histopathology: follicular adenoma.