However, retroflexion of the instrument within the rectum demonstrated a distal As in our patient, anal bleeding is the most common symptom of anal canal. Three roles have been described for retroflexion in colonoscopy: (1) An effective retroflexion visualizes the proximal anal canal and the distal 3–4 cm of rectal.
Download Citation on ResearchGate | On Sep 1, , Scott C Thornton and others published Anoscopy vs. retroflexion for evaluation of the anal canal }. The anal transitional zone is located between the dentate line and anorectal line. (b) Retroflexion with white light shows the dentate line, the anal transitional.
tICRF Colorectal Cancer Unit, St. Mark's Hospital, Harrow, United Kingdom, and lhe tDepartment of PURPOSE: Retroflexion of the endoscope during rectal ex-. rectal cancer is the third leading cause of all cancer deaths in can view the anorectal canal in a retro- flexed position . Rectal perforation during retroflexion .