Table 6 Distribution of sonographic features used in the ACR TI-RADS categorization of thyroid nodules across the FNA results

Composition

 Solid ( +)

 Non solid (-)

21.8

1.4

0.217

Shape

 Taller than wide ( +)

 Wider than tall (-)

10

0.7

0.001

Echogenicity

 Hypoechoic ( +)

 Anechoic/hyper echoic/

 Isoechoic (-)

54.6

0.7

 < 0.001

Margins

 Lobulated/irregular/extra

 Thyroid extension ( +)

 Smooth/ ill defined (-)

31.8

0.7

 < 0.001

Echogenic foci

 Punctate echogenic foci/

 Peripheral calcification ( +)

 None or large comet tail

 Artifact/ macro calcification (-)

27.3

0

 < 0.001

Echogenicity & composition combined

 Solid& hypoechoic nodule ( +)

 Solid & hyperechoic nodule (-)

57.1

1.5

 < 0.001