Table 2 Baseline MRI features of perianal fistula in both groups
Total (n = 136) | Low activity group (n = 77) | High activity group (n = 59) | p value | |
|---|---|---|---|---|
No. of fistula tracks | < 0.001 | |||
Single, unbranched, 1 | 78 | 53 | 25 | |
Single, branched, 2 | 17 | 11 | 6 | |
Multiple, 3 | 41 | 13 | 28 | |
Location | 0.000 | |||
Extra- or intersphincteric, 1 | 105 | 68 | 37 | |
Transphincteric, 2 | 20 | 9 | 11 | |
Suprasphincteric, 3 | 11 | 0 | 11 | |
Extension | < 0.001 | |||
Infralevatoric, 1 | 125 | 77 | 48 | |
Supralevatoric, 2 | 11 | 0 | 11 | |
Hyperintensity on T2WI | < 0.001 | |||
Mild, 4 | 24 | 24 | 0 | |
Pronounced, 8 | 112 | 53 | 59 | |
Collections (cavities > 3 mm diameter) | < 0.001 | |||
Absent, 0 | 84 | 77 | 7 | |
Present, 4 | 52 | 0 | 52 | |
Rectal wall involvement | 0.006 | |||
Normal, 0 | 89 | 58 | 31 | |
Thickened, 2 | 47 | 19 | 28 | |
Total score | ||||
Mean ± SD | 13.6 ± 3.8 | 10.8 ± 2.1 | 17.3 ± 2.1 | < 0.001 |
Range | 7–22 | 7–14 | 15–22 | |
Fistula type | < 0.001 | |||
Simple/complex | 53/83 | 53/24 | 0/59 |