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. 2022 Nov 21;29(Suppl 1):S1–S35. doi: 10.4103/sjg.sjg_277_22

Table 1.

Montreal classifications of UC and CD[83]

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