Inclusion Criteria:  - Indications for Spiral colonoscopy as a rescue procedure because of incomplete antecedent colonoscopy  Exclusion Criteria:  Age under 18 years Known pregnancy Poor health status (ASA classification ≥ 4) Contraindication for sedation or standard colonoscopy Known coagulopathy (INR ≥ 2.0, platelets < 70 /nl) or anticoagulants other than aspirin Medical history of chronic inflammatory bowel disease or suspected bowel obstruction