Sigmoidoscopy is an examination of the bottom one-third of your large intestine, including your rectum and the bottom part of your colon. To do this exam, your doctor uses a sigmoidoscope—a flexible viewing tube with a light and a lens or video camera on one end, and an eyepiece or video monitor on the other. The sigmoidoscope allows your doctor to see the inside of your bowel through fiber optic technology.
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