Anatomic localization and step by step advancement of the fiberoptic colonoscope

Anatomic localization of the tip of a colonoscope without the aid of fluoroscopy is adequate in a majority of patients. External check points of transilluminated light within the colon on the abdominal wall, characteristic internal appearance of the colon and gross anatomic landmarks have been used. An improved technique for advancement results if a routine sequence of maneuvers is used in a similar manner in all patients.