Clinical presentation: A 50-yr-old woman was referred for evaluation of a mass in the thyroid which was detected on CT scan performed because of COVID-19 pneumonia. She has been treated in intensive care unit 3 months before the present visit. Except for fatigue, her complaints have already resolved by the time of the thyroid investigation.

Palpation: a firm nodule in the right lobe.

Laboratory tests: TSH 11.2 mIU/L, aTPO above 1300 U/mL.

Ultrasonography. The thyroid was moderately hypoechoic and inhomogeneous. It had numerous tiny, more hypoechoic areas. There was an iso/hyperechoic nodule in the right lobe. The borders of the nodule were undulated. The lesion presented both perinodular and intranodular vascularity and was rich in vessels.

Cytology of the nodule resulted in Hashimoto's thyroiditis.

Suggestion. We suggested daily 75 microgram levothyroxine and TSH check in three months. A repeat ultrasound was also proposed in year.

Comment. The nodule in the right lobe should be classified as an EU-TIRADS 3 nodule. The border' irregularities should not be overjudge, these were caused by the infiltration of the underlying thyroiditis and not that of the discrete lesion.