Nodule with intracystic echogenic foci and comet-tail artifact.Predominantly cystic and mildly hypoechoic nodule with intracystic echogenic foci showing comet-tail artifacts. Diagnosis: benign follicular nodule. This nodule is benign. ,0,benign
fig5a.jpg,Loss of the perithyroidal echogenic line (arrows) at the site of contact with the thyroid cancer. Diagnosis: minor extrathyroidal extension.This nodule is malignancy."