Clinical presentation: a 74-year-old woman was referred for an evaluation of a nodular goiter which was detected by the patient 3 months earlier.

Palpation: a firm nodule in the right lobe.

Functional state: euthyroidism with TSH 0.72 mIU/L.

Ultrasonography: revealed a hyperechogenic nodule in the right thyroid. The nodule presented a halo sign and perinodular blood flow.

Cytological report: Hürthle-cell tumor.

Histopathology: disclosed Hürthle-cell adenoma.

Comment: the presence of intranuclear groove has only limited significance in the case of oxyphilic cells.