Clinical presentation: A 47-year-old woman was referred for aspiration cytology of a nodule detected on evaluation of dysmenorrhea.

Palpation: No abnormality.

Laboratory tests: TSH 3.91 mIU/L, aTPO 386 U/mL.

Ultrasound. The thyroid was moderately hypoechogenic and had several tiny and a few larger hypoechogenic areas. Neither of them corresponded to a nodule in pathological sense.

Aspiration cytology from the hypoechogenic lesion in the dorsal part of the right lobe resulted in Hashimoto's thyroiditis.

Comment. The lesions are unlikely being nodules in pathological sense.