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A sigmoidoscopy may also be used to take a tissue sample or biopsy. And it can be used to remove polyps or hemorrhoids (swollen veins in your rectum and anus). It is also a screening test for colon cancer and rectal cancer.
A sigmoidoscopy is performed using a thin, flexible tube called a sigmoidoscope. The tube has a tiny light and a camera. The tube is put into your anus and moved slowly through your rectum into the lower part of your colon. The tube is used to blow air into your colon, which makes the colon swell up a bit to improve visibility.
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