Colonoscopy: Obtaining a Biopsy Sample
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Colonoscopy is a form of endoscopy used to visualize the large intestine. The intestinal lining initially appears smooth and normal, but a bulging discolored abnormal growth is later seen. Next, small clippers attached to a metal wire are inserted through the endoscope and used to grab the growth. A tissue sample is removed for biopsy. The small amount of blood seen is normal after a biopsy.
(Courtesy of Jerome D. Waye, MD.)