Fig. 4

A 16-year-old male patient with FNAB-proven focal nodular hyperplasia. Transverse scan for right lobe of the thyroid gland performed by linear probe. On the right side of the figure, grayscale US shows a hyperechoic nodule with a well-defined margin. On the left side of the figure, SWE displays a heterogeneous color elasticity signal with peripheral high SWE areas (red)