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Table 3 MRI findings according to Van Assche scoring system

From: Preoperative MRI of perianal fistula evaluation and its impact on surgical outcome

 Score parametersItems (score =)Number (%)
Local extensionNumber of fistula tractsNone (0)9 (13.8%)
SingleUnbranched (1)46 (70.8%)
Branched (2)10 (15.4%)
Multiple (3)0 (0%)
LocationExtra-sphincteric (1)28 (43.1%)
Inter-sphincteric (1)25 (38.5%)
Trans-sphincteric (2)9 (13.8%)
Supra-sphincteric (3)3 (4.6%)
ExtensionInfralevatoric (1)62 (95.4%)
Supralevatoric (2)3 (4.5%)
Active inflammationHyperintensity on T2-weighted imagesAbsent (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 involvementNormal (0)56 (86.2%)
Thickened (2)9 (13.8%)