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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 parameters

Items

Score

Local extension

Number of fistula tracts

None

0

Single

Unbranched

1

Branched

2

Multiple

3

Location

Extra- or inter-sphincteric

1

Trans-sphincteric

2

Supra-sphincteric

3

Extension

Infralevatoric

1

Supralevatoric

2

Active inflammation

Hyperintensity on T2-weighted images

Absent

0

Mild

4

Pronounced

8

Collections (cavities > 3 mm in diameter)

Absent

0

Present

4

Rectal wall involvement

Norma

0

Thickened

2