Clinical presentation: a 19-year-old woman with a newly discovered nodule.

Palpation: a firm nodule in the right lobe.

Functional state: euthyroidism with TSH-level 0.88 mIU/L.

Ultrasonography: a solitary cystic nodule in the right lobe with increased "blood flow".

Six mL brown cystic fluid was aspirated. Cytological report: benign, cystic degeneration.

Suggestion: regular follow-up examinations.