Microcalcification |
Punctuate echogenic foci without acoustic shadowing or associated comet-tail artifact |
Present |
0.5 |
0.1 |
Absent |
0.5 |
0.9 |
Shape: Taller than wide |
AP dimension > transverse dimension |
Present |
0.25 |
0.05 |
Absent |
0.75 |
0.95 |
Margin |
Margin of the thyroid nodule |
Smooth |
0.15 |
0.5 |
Irregular |
0.35 |
0.3 |
Ill_defined |
0.50 |
0.2 |
Capsular invasion |
Extension of a nodule beyond the thyroid capsule |
Present |
0.2 |
0.0005 |
Absent |
0.8 |
0.9995 |
Architecture |
Composition of the thyroid nodule |
Solid |
0.82 |
0.5 |
Almost_solid (<25% cystic) |
0.10 |
0.17 |
Mixed (25–75% cystic) |
0.05 |
0.17 |
Cystic (>75% cystic) |
0.03 |
0.16 |
Echogenicity |
The echogenicity of the thyroid nodule relative to surrounding thyroid parenchyma |
Hypoechoic |
0.85 |
0.5 |
Isoechoic |
0.1 |
0.25 |
Hyperechoic |
0.05 |
0.25 |
Ring down artifact |
Punctuate echogenic foci associated with comet-tail artifact |
Present |
0.00005 |
0.08 |
Absent |
0.99995 |
0.92 |
Vascularity |
Whether flow is seen on color Doppler interrogation |
Intrinsic |
0.55 |
0.4 |
Perinodular |
0.44 |
0.4 |
avascular |
0.01 |
0.2 |