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A device consisting of a tube with a light and a lens on the end which may be inserted into a body opening or incision. An endoscope can be flexible or rigid. Typically used to examine hollow organs inside the body, including the esophagus, stomach, duodenum, colon, or rectum, but also used to take tissue from the body for testing. Optionally, an endoscope can be attached to a camera to take color photographs of the inside of the body or for viewing on a video screen.