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Copyright ©2008 The WJG Press and Baishideng.
World J Gastroenterol. Sep 28, 2008; 14(36): 5512-5518
Published online Sep 28, 2008. doi: 10.3748/wjg.14.5512
Table 2 Montreal classification of Crohn's disease[13]
Parameter
Age at diagnosisA1 ≤ 16 yr
A2 17-40 yr
A3 ≥ 40 yr
Maximal location of disease prior to first surgeryL1 Terminal ileal
L2 Colonic
L3 Ileocolonic
L4 Upper GI only
+L4 Additional designation to be added if patient has upper GI and distal disease
Disease behaviorB1 Nonstricturing, nonpenetrating (inflammatory)
B2 Stricturing
B3 Penetrating disease
P = Perianal penetrating disease
Recommended behavior assessed > 5 yr after diagnosis