Table 1.

Sonographic characteristics of evaluated thyroid nodules (n = 1029)

Composition	Cystic or completely cystic (7.6%)	Spongiform (12.7%)	Mixed cystic and solid (31.8%)	Solid or almost completely solid (47.9%)
Echogenicity	Anechoic (5.9%)	Very hypoechoic (1.5%)	Hypoechoic (16.4%)	Hyper- or isoechoic (76.2%)
Shape	Wider than tall (97.2%)		Taller than wide (2.8%)
Margin	Smooth (93.9%)	Ill-defined (4.2%)	Lobulated or irregular (1.4%)	Extra-thyroidal Extension (0.6%)
Hyperechoic components	None (90.7%)	Large comet tail artifacts (1.9%)	Macro calcifications (3.3%)	Peripheral rim calcification (0.8%)	Punctate echogenic foci (3.3%)