Table 2 The association between imaging characteristic and KRAS mutation based on an independent sample t test or Mann-Whitney U test

Axial tumor length (ATL) (cm)

(n = 69)

(n = 46)

 Median (min-max)

1.9 (1.0–6.4)

2.2 (1.1–7.7)

0.815

 Mean (SD)

2.37 (1.12)

2.35 (1.08)

0.937

Longitudinal tumor length (LTL) (cm)

(n = 69)

(n = 46)

 Median (min-max)

6.3 (1.3–15.0)

6.0 (1.28–16.0)

0.564

 Mean (SD)

6.67 (2.90)

6.48 (2.87)

0.723

ATL/LTL

(n = 69)

(n = 46)

 Median (min-max)

0.35 (0.12–1.75)

0.38 (0.08–2.19)

0.521

 Mean (SD)

0.42 (0.29)

0.43 (0.31)

0.888

Tumor locations (%)

(n = 69)

(n = 46)

0.584

 Left side

61 (88.41)

39 (84.78)

 Right side

8 (11.59)

7 (15.22)

Tumor gross patterns (%)

(n = 69)

(n = 46)

 Polypoid

30 (43.48)

23 (50)

0.568

 Ulcerative

3 (4.35)

1 (2.17)

0.649

 Circumferential wall thickening

42 (60.87)

23 (50)

0.258

Tumor margin (%)

(n = 69)

(n = 46)

0.390

 Smooth

0 (0.00)

1 (2.17)

 Lobulate

69 (92.54)

43 (93.48)

 Infiltrating

5 (7.46)

2 (4.35)

Tumor enhancement patterns (%)

(n = 69)

(n = 46)

0.736

 Homogenous

7 (10.14)

4 (8.70)

 Heterogeneous < 50%

25 (31.88)

12 (26.09)

 Heterogeneous ≥ 50%

40 (57.97)

30 (65.22)

T stage (%)

(n = 68)

(n = 46)

0.955

 2

30 (43.48)

21 (45.65)

 3

24 (34.78)

16 (34.78)

 4

15 (21.74)

9 (19.57)