Table 2 Ultrasonographic nodule characteristics with or without cervical LNM.

Size, cm

1.473 ± 1.085

0.819 ± 0.418

63.590

0.000

Shape

Regular

4

21

10.457

0.0012

Irregular

67

64

Margin

Well-defined

16

42

11.965

0.0005

Ill-defined

55

43

Echogenicity

Homogeneous

53

80

11.667

0.0006

Heterogeneous

18

5

Hypoechoic

68

81

0.060

0.807

Heterogeneous isoechoic

2

2

0.106

0.744

Cystic-solid mixed

1

2

0.025

0.875

Calcification

Absent

23

45

6.642

0.01

macrocalcification

6

7

0.002

0.961

Microcalcification

42

33

6.406

0.011

Vasculalarity

Type I

32

45

2695.00

0.216

Type II

25

30

Type III

14

10

Internal enhancement pattern

Homogeneous low-enhancement

4

22

11.420

0.0007

Heterogeneous low-enhancement

51

37

12.602

0.0004

Homogeneous isoenhancement

4

7

0.3995

0.527

Heterogeneous isoenhancement

4

10

1.780

0.182

Homogeneous high-enhancement

1

3

0.697

0.404

Heterogeneous high-enhancement

7

6

0.397

0.529

Peripheral enhancement rings

No ring

58

66

0.388

0.533

Irregular high-enhanced rings

2

11

2.167

0.141

Irregular non-enhanced rings

10

13

4.25

0.04

Regular non-enhanced rings

0

3

1.44

0.23

ECE on CEUS

Yes

44

4

59.557

0.0000

No

27

81

ECE on US

Yes

25

1

32.265

0.0000

No

46

84