Previously, the colon was examined with an endoscope every 5 years to find polyps, which are benign changes in the colon wall that can develop into colon cancer. However, only a few, around 5% of all patients examined, exhibit these changes. Classic endoscopy (fiberoptic video endoscopy) has the disadvantage that the colon is often difficult to navigate with the endoscope, especially in older people. The ascending colon is often not reached, or only with difficulty. Polyps and even larger tumors can thus be overlooked. There is also a risk of perforation of the bowel wall if the endoscope is difficult to navigate. Video endoscopy can also only show changes in the interior of the intestine (lumen). Changes in the intestinal wall or outside, in the abdominal cavity, remain hidden from view through the endoscope.