Clinical presentation: A 34-year-old woman came to follow-up examination. She was treated for hypothyroidism for 4 years. We met the patient 17 months before the present examination while she was on 8th week of pregnancy. At this time, a nodule was diagnosed. Aspiration cytology resulted in follicular tumor. We told the patient that she will need to have surgery once she has finished breastfeeding.

Palpation. Both lobes were firm, the left lobe was nodular on palpation.

Laboratory tests: TSH 0.02 mIU/L, FT4 8.05 pM/L on daily 125 microgram levothyroxine.

Ultrasonography. The thyroid was moderately hypoechogenic and contained multiple discrete hypoechogenic areas corresponding to autoimmune thyroiditis. There was a more homogeneous lesion in the ventral part of the right lobe. The nodule had lobulated margins and both perinodular and intranodular blood flow.

A left lobectomy was performed. Histopathology resulted in benign trabecular adenoma and Hashimoto's thyroiditis in the extranodular part.