Underreporting of strictures in the Montreal classification

Background: Crohn's disease (CD) is often complicated by a stricturing and/or fistulating phenotype necessitating surgery. Both complications account for the classification of behavior according to the Montreal Classification (MC) in a hierarchic manner which might lead to loss of information about stricture formation in case of concomitant presence of enteral penetration. Methods: The aim of the study was to identify the underreporting of strictures as defined by the MC. A total of 548 consecutive CD patients who consented to participate in a study programme on genetics were included. For each patient, a detail…