Figure 1.

Representative thyroid nodule images from the study cohort exhibiting ultrasound features that are more suspicious vs less suspicious for malignancy. More suspicious features include A, irregular margins; B, microcalcifications presenting as punctate echogenic foci; C, taller-than-wide shape on transverse view; and D, extrathyroidal extension. Less suspicious features include E, cystic-appearing composition; F, spongiform composition; G, hyperechogenicity; and H, smooth margins.