Categories used in Montreal classification (adults) | Modified categories used in Paris classification (children and adolescents) | Definition | |
Age at diagnosis | A1 | A1a | 0 to <10 years |
A1b | 10 to <17 years | ||
A2 | 17 to 40 years | ||
A3 | >40 years | ||
Location | E1 | Ulcerative proctitis | |
E2 | Left-sided ulcerative colitis (extending distal to the splenic flexure) | ||
E3 | E3 | Extensive (extending distally from the hepatic flexure) | |
E4 | Pancolitis (including areas proximal to the hepatic flexure) | ||
Severity | S0 | Never severe* | |
S1 | Ever severe* | ||
Growth | G0 | No growth delay | |
G1 | Growth delay (impaired linear growth)¶ |
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