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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