TPO and Hashimoto thyroiditis: According to the presence of thyroid autoantibodies (anti-TPO and/or anti-TG), Hashimoto’s thyroiditis was diagnosed in 22 patients (16.9%), the majority of whom were euthyroid, while three had overt hypothyroidism determined by elevated levels of TSH, decreased levels of fT4, and typical ultrasound findings for Hashimoto's thyroiditis: a slightly enlarged thyroid gland with a mildly heterogeneous echotexture.