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. 2020 Jun 23;20:178. doi: 10.1186/s12866-020-01856-x

Table 2.

Montreal classification of Crohn’s disease

Criteria n (%)
Age at Diagnosis (A)
 A1: 16 years or less 2 (8.3%)
 A2: 17–40 years 17 (70.8%)
 A3: 40 years or more 5 (20.8%)
Localization (L)
 L1: Terminal Ileum 9 (37.5%)
 L2: Colon 1 (4.2%)
 L3: Ileocolonic 14 (58.3%)
Behavior (B)
 B1: Not stenting, non-penetrating 5 (20.8%)
 B2: Stenting 8 (33.3%)
 B3: Penetrating 6 (25.0%)
 B1p: Not stenting, non-penetrating + perianal fistula 1 (4.2%)
 B2p: stenting + perianal fistula 2 (8.3%)
 B3p: penetrating + perianal fistula 2 (8.3%)