Clinical presentation: a 27-year-old woman requested an evaluation because her mother had hypothyroidism. A hypoechogenic nodule was described on ultrasound. She had no complaints.

Palpation: no abnormality.

Functional state: subclinical hypothyroidism (TSH 7.74 mIU/L, FT4 11.1 pM/L, aTPO 358 U/mL).

Ultrasonography: the thyroids were echonormal and contained hypoechogenic areas not fitting a nodule. The echogenicity index was around 20%. The vascularization was decreased.

Cytology: resulted in Hashimoto's thyroiditis.