Table 1.
Montreal classification of UC | ||
---|---|---|
Extent | E1 | Ulcerative proctitis |
E2 | Left-sided UC (distal to splenic flexure) | |
E3 | Extensive (proximal to splenic flexure) | |
Severity | S0 | Clinical remission |
S1 | Mild UC | |
S2 | Moderate UC | |
S3 | Severe UC | |
| ||
Montreal classification of CD | ||
| ||
Age at diagnosis | A1 | <16 years |
A2 | 17- 40 years | |
A3 | >40 years | |
Location | L1 | Ileal |
L2 | Colonic | |
L3 | Ileocolonic | |
L4 | Isolated upper GI disease | |
Behavior | B1 | Non-stricturing, non-penetrating |
B2 | Stricturing | |
B3 | Penetrating | |
P | Perianal disease modifier |
UC=ulcerative colitis, CD=Crohn’s disease