Table 3 MRI findings according to Van Assche scoring system
From: Preoperative MRI of perianal fistula evaluation and its impact on surgical outcome
Score parameters | Items (score =) | Number (%) | ||
|---|---|---|---|---|
Local extension | Number of fistula tracts | None (0) | 9 (13.8%) | |
Single | Unbranched (1) | 46 (70.8%) | ||
Branched (2) | 10 (15.4%) | |||
Multiple (3) | 0 (0%) | |||
Location | Extra-sphincteric (1) | 28 (43.1%) | ||
Inter-sphincteric (1) | 25 (38.5%) | |||
Trans-sphincteric (2) | 9 (13.8%) | |||
Supra-sphincteric (3) | 3 (4.6%) | |||
Extension | Infralevatoric (1) | 62 (95.4%) | ||
Supralevatoric (2) | 3 (4.5%) | |||
Active inflammation | Hyperintensity on T2-weighted images | Absent (0) | 21 (32.3%) | |
Mild (4) | 25 (38.5%) | |||
Pronounced (8) | 19 (29.2%) | |||
Collections (cavities > 3 mm in diameter) | Absent (0) | 41 (63.1%) | ||
Present (4) | 24 (36.9%) | |||
Rectal wall involvement | Normal (0) | 56 (86.2%) | ||
Thickened (2) | 9 (13.8%) | |||