Montreal classification for Crohn disease

Age at diagnosis

A1 below 16 years

A2 between 17 and 40 years

A3 above 40 years

Location

L1 ileal

L2 colonic

L3 ileocolonic

L4 isolated upper disease*

Behavior

B1 nonstricturing, nonpenetrating

B2 stricturing

B3 penetrating

p perianal disease modifier^¶

* L4 is a modifier that can be added to L1-L3 when concomitant upper gastrointestinal disease is present.
¶ "p" is added to B1-B3 when concomitant perianal disease is present.

Reproduced from: Gut, Satsangi J, Silverberg MS, Vermere S, Colombel JF. The Montreal classification of inflammatory bowel disease: controversies, consensus, and implications, 55:749-53, copyright © 2006, with permission from BMJ Publishing Group Ltd.

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