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Magnetic resonance imaging-based score for severity of perianal Crohn’s disease as described by Van Assche et al. [31]
| Number of fistula tracks | |
| None | 0 |
| Single, unbranched | 1 |
| Single, branched | 2 |
| Multiple | 3 |
| Location | |
| Extra- or intersphicteric | 1 |
| Transsphicteric | 2 |
| Suprasphinteric | 3 |
| Extension | |
| Infraelevatoric | 1 |
| Supraelevatoric | 2 |
| Hyperintensity on T2-weighted images | |
| Absent | 0 |
| Mild | 4 |
| Pronounced | 8 |
| Collections (cavities >3 mm diameter) | |
| Absent | 0 |
| Present | 4 |
| Rectal wall involvement | |
| Normal | 0 |
| Thickening | 2 |
