The commonest site of perforation during colonoscopy is -: (A) Caecum, (B) Hepatic flexure, (C) Splenic flexure, (D) Sigmoid colon
Answer is D. • Risks of colonoscopy: Perforation and hemorrhage
• MC site of bleeding after colonoscopy: Stalk after polypectomy.
• MC site of perforation during colonoscopy: Sigmoid colon
• Perforation can be caused by excessive air pressure, tearing of the antimesenteric border of the colon from excessive pressure on colonic loops, and at the sites of electrosurgical applications