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Is ileocaecal Crohn’s disease L1 or L3 according to the Montreal classification?
  1. Laurent Peyrin-Biroulet
  1. Dr Laurent Peyrin-Biroulet, Department of Hepato-Gastroenterology, University Hospital of Nancy, Allée du Morvan, 54 511 Vandoeuvre-les-Nancy, France; peyrin-biroulet{at}

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In a recent issue of the journal, Satsangi et al reviewed the key issues that have emerged from discussions of the Montreal Working Party (Gut 2006;55:749–53). One problem that I have encountered in my clinical practice is to define ileocaecal Crohn’s disease according to the Montreal classification. In both articles on the Montreal classification, terminal ileum involvement is L1, colonic disease is L2, and ileocolonic involvement is L3.1 Should we consider ileocaecal Crohn’s disease as L1 or L3 according …

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