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Table 1 MRI-based Van Assche scoring system

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

 Score parametersItemsScore
Local extensionNumber of fistula tractsNone0
SingleUnbranched1
Branched2
Multiple3
LocationExtra- or inter-sphincteric1
Trans-sphincteric2
Supra-sphincteric3
ExtensionInfralevatoric1
Supralevatoric2
Active inflammationHyperintensity on T2-weighted imagesAbsent0
Mild4
Pronounced8
Collections (cavities > 3 mm in diameter)Absent0
Present4
Rectal wall involvementNorma0
Thickened2