Table 1 St. James’s University Hospital MR imaging classification of fistula in ano [30]
From: Current imaging techniques for evaluation of fistula in ano: a review
Grades | Description |
|---|---|
0 | Normal appearance on MR imaging |
1 | Simple linear intersphincteric fistula |
2 | Intersphincteric fistula with intersphincteric abscess or secondary fistulous track |
3 | Transsphincteric fistula |
4 | Transsphincteric fistula with abscess or secondary track within the ischiorectal fossa |
5 | Supralevator and translevator disease |