title: Second look colonoscopy: indication and requirements.
abstract: BACKGROUND
  There are circumstances when a colonoscopy should be repeated after a short interval following the first endoscopic procedure which has not completely fulfilled its objective.
  
  
  METHODS
  A second look colonoscopy is proposed when there remains a doubt about missed neoplastic lesions, either because the intestinal preparation was poor or because the video-endoscope did not achieved a complete course in the colon. The second look colonoscopy is also proposed at a short interval when it is suspected that the endoscopic removal of a single or of multiple neoplastic lesions was incomplete and that a complement of treatment is required. When the initial endoscopic procedure has completely fulfilled its objective, a second look colonoscopy can be proposed at longer intervals in surveillance programs. The intervals in surveillance after polypectomy are now adapted to the initial findings according to established guidelines. This also applies to the surveillance of incident focal cancer in patients suffering from a chronic inflammatory bowel disease.
  
  
  CONCLUSIONS
  Finally, in most developed countries, a priority is attributed to screening of colorectal cancer and focus is given on quality assurance of colonoscopy which is considered as the gold standard procedure in the secondary prevention of colorectal cancer.
authors.affiliation: Institut Arnault Tzanck, Lyon, France. jean-francois.rey@wanadoo.fr
authors.forename: Jean-Francois
authors.initials: JF
authors.lastname: Rey
authors.forename: Rene
authors.initials: R
authors.lastname: Lambert
mesh_terms: D003113:Colonoscopy / Q000379:methods*; D015179:Colorectal Neoplasms / Q000601:surgery*; D003951:Diagnostic Errors; D006801:Humans; D018579:Patient Selection; D017410:Practice Guidelines as Topic; D011786:Quality Control; D024162:Second-Look Surgery