Sensitivity (%)

Specificity (%)

PPV

NPV

p value

Echogenicity

Hypoechoic

72% (36/50)

66% (46/70)

60%

77%

0.01

Vascularity

Intra-nodular

88% (44/50)

69% (48/70)

67%

89%

0.01

Calcification

Micro-calcification

48% (24/50)

94% (66/70)

86%

72%

0.01

Echo structure

Solid

74% (37/50)

63% (44/70)

59%

77%

0.01