Clinical presentation: A 59-year-old woman referred for an evaluation of a newly discovered nodule.

Palpation: a hard nodule in the right thyroid.

Functional state: euthyroidism.

Ultrasonography: There was a hypoechogenic nodule in the right lobe. The nodule displayed an incomplete halo.

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

Histopathology: widely invasive follicular cancer.