St James's University Hospital MR Imaging Classification of Perianal Fistulas
Grade
|
Description
|
0
|
Normal appearance
|
1
|
Simple linear intersphincteric fistula
|
2
|
Intersphincteric fistula with intersphincteric abscess or secondary fistulous track
|
3
|
Trans–sphincteric fistula
|
4
|
Trans–sphincteric fistula with abscess or secondary track within the ischioanal or ischiorectal fossa
|
5
|
Supralevator and translevator disease
|
