Clinical presentation: a 29-year-old woman was referred for an evaluation of a nodule discovered on screening.

Palpation: no abnormality.

Functional state: euthyroidism with TSH 1.62 mIU/L.

Ultrasonography: the thyroids were hypoechogenic. There were several hyperechogenic circumscribed lesions in both lobes.

FNAC: was performed from the hyperechogenic lesion in the left lobe. Cytology disclosed chronic lymphocytic thyroiditis with follicular proliferation.

Comment: two years after the initial examination, the size of the lesion decreased by more than 30% in volume.