Clinical data: a 51-year-old woman with a newly discovered nodule.

Palpation: a firm nodule in the left lobe.

Functional state: subclinical  hypothyroidism with TSH-level 6.00 mIU/L, FT4 12.4 pM/L.

Ultrasonography: a solitary hypoechogenic nodule in the left lobe. No signs of thyroiditis.

Cytological report: suspicion of malignant thyroid tumor.

Histopathology: trabecular adenoma with degenerative changes and focal lymphocytic thyroiditis.