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 |