Fig 1.
A 46-year-old woman with degenerated multinodular goiter.
Longitudinal sonogram shows a 35 mm, smooth, cystic anechoic nodule in the left thyroid lobe. Echogenic foci with comet-tail artifact freely distributed (solid arrow) (Type 1). The patient underwent surgery due to contralateral thyroid malignancy.
Fig 2.
A 41-year-old man with multinodular goiter.
Longitudinal sonogram shows an 36-mm, smooth, mixed isoechoic nodule in the right thyroid lobe. Echogenic focus is located at the margin of solid component (solid arrow); comet-tail artifact is located within the cystic component (Type 2).
Fig 3.
A 31-year-old woman with papillary thyroid carcinoma.
Longitudinal sonogram shows a 5-mm, smooth, solid hypoechoic nodule in the right thyroid lobe. The echogenic focus (solid arrow) is located at the margin of intra-nodular micro-cyst. Comet-tail artifact was detected in the solid component (Type 2).
Fig 4.
A 52-year-old woman with papillary thyroid carcinoma.
Longitudinal sonogram showing a 45-mm, ill-defined, hypoechoic solid nodule in the right thyroid lobe. A linear echogenic focus with reverse-triangle artifact (solid arrow), and a round echogenic focus with fine artifact (arrowhead), and a punctate echogenic foci (faint arrow) are seen (Type 3).
Table 1.
Baseline characteristics of study participants (n = 63).
Table 2.
Distribution of sonographic findings of 78 echogenic foci with comet-tail artifact in 71 nodules compared with pathological results.