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Table 2 CUS characteristics of renal masses

From: The independent indicators for differentiating renal cell carcinoma from renal angiomyolipoma by contrast-enhanced ultrasound

Characteristics

Description

AML(n = 22)

RCC(n = 150)

x2 / t

P-value

Size

mean ± SD (mm)

34.7 ± 22.2

40.4 ± 22.1

1.136

0.258a

Shape

Round/Oval

20(90.9)

121(80.7)

0.757

0.384c

Irregular

2(9.1)

29(19.3)

  

Margins

Well defined

21(95.5)

114(76.0)

3.226

0.072c

Poorly defined

1(4.5)

36(24.0)

  

Orientation

Outward from the renal capsule

18(81.8)

101(67.3)

1.888

0.169b

Inward at the renal parenchyma

4(18.2)

49(32.7)

  

Echogenicity

Hyper-echoic

17(77.3)

23(15.3)

33.153

0.000b

Iso-echoic

1(4.5)

28(18.7)

  

Hypo-echoic

4(18.2)

99(66.0)

  

Homogeneity

Homogeneous

17(77.3)

97(64.7)

1.364

0.243b

Heterogeneous

5(22.7)

53(35.3)

  

Blood flow signals in CDFI

Abundant inside

1(4.5)

25(16.7)

25.451

0.000d

Inside and perilesional

0(0)

37(24.7)

  

Perilesional

0(0)

29(19.3)

  

Slight inside

5(22.7)

10(6.7)

  

Without

16(72.7)

49(32.7)

  
  1. AML angiomyolipoma, RCC renal cell carcinoma, CDFI color Doppler flow imaging; Values are presented as the number (%); aIndependent-Sample t-test and Mann-Whitney U test; bPearson’s Chi square test; cContinuous Correction Chi square; dFisher’s exact test