colonoscopy procedure concept

colonoscopy colon colonoscope intestine cancer tube vector colorectal endoscope polyp procedure diagram large medical anatomy endoscopy illustration screening colitis digestive sigmoidoscopy checkup polyps polypectomy lactobacillus detection bowel gastrointestinal section surgery disease human duodenoscope gastroenterologist gastroscopy instrument prevention rectum anus internal organ graphic endoscopic equipment intestinal care examination silhouette exam research