Table 2 Comparison of imaging parameters between dMMR and pMMR colorectal cancer

No. of imagings

32

249

Tumour

 Enhancement degree

 < 0.001

  Hyperenhancement or isoenhancement

16(50%)

220(88%)

  Hypoenhancement

16(50%)

29(12%)

 Enhancement pattern

 < 0.001

  Inhomogenous

21(66%)

65(26%)

  Homogenous

11(34%)

184(74%)

 Hypoattenuation-within-tumour ratio

 < 0.001***

   < 1/3

16(50%)

229(92%)

  1/3–2/3

5(16%)

8(3%)

   > 2/3

11(34%)

12(5%)

Lymph node

 Largest LN short diameter (IQR, range)

7.0(2.0,4.00–11.0)

6.0(3.0,3.0–16.0)

0.014

 Largest LN long diameter (IQR, range)

9.0(5.0,4.00–19.00)

8.0(5.0,3.0–24.0)

0.116

 No. of LNs ≥ 5 mm (IQR, range)

6.0(5.0,0–15)

4.0(6.0,0–35)

0.074

 No. of LNs ≥ 8 mm (IQR, range)

2.00(4.0,0–7)

1.00(2.0,0–15)

0.016

 No. of LNs ≥ 10 mm (IQR, range)

0.5(2.0,0–4)

0(1.0,0–7)

0.177