Clinical data: a 54-year-old woman was referred for a follow-up examination. She noticed an increase of the nodule during the previous months. She was known to harbor a nodule for 7 years when aspiration cytology resulted in a benign lesion.

Palpation: a moderately firm nodule in the right lobe.

Result of blood tests: euthyroidism (TSH-level 3.38 mIU/L).

Ultrasonography: the thyroids were echonormal. There was a moderately hypoechogenic nodule in the right lobe. The nodule displayed a halo sign and perinodular blood flow.

Cytology: resulted in follicular tumor.

Histopathology: disclosed follicular adenoma.