colon polyps removal. colonoscopy and polypectomy

polyp colon surgery removal cancer colonoscopy polypectomy prevention human large intestine endoscope closeup cross bowel flat stalk performed electrocautery anus cure anatomy treatment colorectal disease endoscopic tumor rectum intestinal digestion digestive therapy precancerous gastrointestinal patient biopsy polyps esophagus operation gut chemotherapy colitis tissue endoscopy gastroenterology rectal location histology screening adenoma bleeding