Clinical data: a 38-year-old woman was referred for aspiration cytology. She was treated for hypothyroidism for six months when ultrasound was performed.

Palpation: no abnormality.

Functional state: euthyroidism on daily 75 microgram levo-tiroxin (2.97 mIU/L).

The nodule in question is the mass composed of two solid lesions in the left lobe.