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Montreal classification
GI Calculator List| Age at diagnosis | A1 | ≤ 16 years |
|---|---|---|
| A2 | 17-40 years | |
| A3 | > 40 years | |
| Location | L1 | Terminal ileum (the lower third of the small bowel with or without spill over into cecum) |
| L2 | Colon | |
| L3 | Ileocolon (terminal ileum + any location between ascending colon and rectum) | |
| L4 | Isolated upper disease (a modifier that can be added to L1-L3 when concomitant upper gastrointestinal disease is present) | |
| Behavior | B1 | Nonstricturing nonpenetrating |
| B2 | Stricturing | |
| B3 | Penetrating |
Silverberg MS, Satsangi J, Ahmad T, et al. Toward an integrated clinical, molecular and serological classification of inflammatory bowel disease: report of a Working Party of the 2005 Montreal World Congress of Gastroenterology. Can J Gastroenterol. 2005;19 Suppl A:5A-36A. doi:10.1155/2005/269076
