Clinical presentation: a 29-year-old woman with a newly diagnosed hypothyroidism. She had delivered 14 month earlier.

Functional state: hypothyroidism (TSH 53.8 mIU/L, FT4 7.8 pM/L).

Ultrasonography: revealed a hypoechogenic thyroid with a large echonormal nodule in the left lobe.

Cytological report: Hürthle-cell tumor.

Histopathology: disclosed Hürthle-cell adenoma.