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Crohn's Montreal Classification Montreal L-category - L1 - Terminal ileum - L2 - Colon - L3 - Ileocolon - L4 - Upper GI tract - L4+L3 - Upper GI tract and distal disease Montreal B-category - B1 - Without stricture formation, non-penetrating - B2 - Stricturing - B3 - Penetrating - B3p - Perianally penetrating #Crohns #Disease #Montreal #Classification #categories #diagnosis #gastroenterology