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A resectoscope is a surgical instrument used to remove tissue from the uterus, prostate, bladder, or urethra. It is a type of endoscope, an instrument that combines a camera and instrumentation so doctors can view a surgical site and perform surgery through the same incision.
A colonoscopy is similar to a sigmoidoscopy, but a longer flexible viewing tube called a colonoscope is used to examine the entire colon and (if necessary) the lower portion of the small intestine. It is typically performed to detect colorectal cancer and to determine the causes of rectal bleeding, chronic diarrhea, chronic constipation, or abdominal pain.