The sigmoidoscopy test is used to examine the sigmoid colon, which is the lower part of your colon or large intestine. This part of your colon is near your rectum and anus. A sigmoidoscopy can also be used to collect a tissue sample or perform a biopsy. It can also be used to remove polyps and hemorrhoids (swollen veins in your rectum and anus). It is also used to screen for colon and rectal cancer. A sigmoidoscope, a thin, flexible tube, is used to perform a sigmoidoscopy. The tube contains a small light and a camera. The tube is inserted into your anus and slowly moved through your rectum into the lower part of your colon. The tube is used to blow air into your colon, causing it to swell slightly to improve visibility.
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