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Table 3 Modified montreal classification [19]

From: Healing of rectal advancement flaps for anal fistulas in patients with and without Crohn’s disease: a retrospective cohort analysis

 

n = 55

Age at diagnosis

 

 A1 (< 16 years)

2 (3.6)

 A2 (17–39 years)

34 (61.8)

 A3 (> 40 years)

19 (34.6)

Location of disease

 

 L1 (ileal)

0

 L2 (colon)

0

 L3 (ileocolonic)

0

 L4 (upper disease)

0

 Anal/perianal

55 (100)

Behavior

 

 B1 (inflammatory)

0

 B2 (stricturing)

0

 B3 (penetrating)

0

 Fistulas

55 (100)