Figure 1

Transverse (A) and longitudinal (B) US images of G1: diffusely enlarged thyroid gland with normal echogenicity, similar to a normal thyroid gland and hyperechoic compared with the anterior strap muscle (asterisk) without heterogeneity.

Transverse (A) and longitudinal (B) US images of G1: diffusely enlarged thyroid gland with normal echogenicity, similar to a normal thyroid gland and hyperechoic compared with the anterior strap muscle (asterisk) without heterogeneity.