The Vienna classification is used to describe the clinical phenotype for a patient with Crohn's disease. It should be viewed as a dynamic model that can change as the disease evolves.
(1) age at diagnosis (A)
(2) location (L) based on maximal extent of the disease prior to the first bowel resection
(3) behavior (B)
age at diagnosis
< 40 years
>= 40 years
terminal ileum with or without involvement of the cecum
both ileum and colon
upper GI tract
stricturing (without penetrating features)
• Penetrating disease involves intra-abdominal or perianal fistula, perianal ulcer, inflammatory mass, or abscess, with or without strictures.
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