Table 1 Montreal classification
Classification | Description |
|---|---|
Age of onset (A) | |
A1 | 16 years old or younger |
A2 | 17-40 years old |
A3 | Over 40 years old |
Location (L) | |
L1 | Terminal ileum |
L2 | Colon |
L3 | Ileocolon |
L4 | Upper gastrointestinal |
Behavior (B) | |
B1 | Non-stricturing, non-penetrating |
B2 | Stricturing |
B3 | Penetrating |