Clinical data: a 69-year-old woman was referred for an evaluation of a thyroid nodule. She had difficulties in swallowing.

Palpation: a firm nodule in the right lobe.

Functional state: euthyroidism (TSH 3.49 mIU/L).

Ultrasonography: a moderately hypoechogenic nodule occupied almost the entire right lobe. Halo sign was not present on gray scale mode. The presence of perinodular blood flow was equivocal.

Cytological diagnosis: follicular tumor with less than the average risk of malignancy.

Histopathology revealed microfollicular adenoma.