Sigmoidoscopy is the
visual examination of the inside of the rectum and sigmoid colon, using a
lighted, flexible tube connected to an eyepiece or video screen for viewing.
This device is called an endoscope. The colon (large intestine) is 5 to 6 feet
long. During a sigmoidoscopy, only the last 1 to 2 feet of the colon is
examined. This last part of the colon, just above the rectum, is called the
sigmoid colon.
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