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Paris classification of UC
| Involvement | E1 | Ulcerative proctitis |
| E2 | Left colitis (anorectal side above the splenic flexure) | |
| E3 | Extensive lesions (anorectal side above the hepatic curvature) | |
| E4 | Total colitis (oral side of the hepatic curvature) | |
| Severity | S0 | No history of severe disease |
| S1 | History of severe disease |
Severe disease: Pediatric Ulcerative Colitis Activity Index ages ≥ 65 years
UC ulcerative colitis
