From www.uptodate.com
Ultrasonographic features that are associated with an increased risk of thyroid cancer
Hypoechoic
Microcalcifications
"Twinkling" on B-flow imaging
Central vascularity
Irregular margins
Incomplete halo
Nodule is taller than wide
Documented enlargement of a nodule
Ultrasonographic features that are associated with an low risk of thyroid cancer
Hyperechoic
Large, coarse calcifications (except medullary cancer)
Peripheral vascularity
Resembles puff or Napoleon pastry
Comet-tail shadowing
