Topics Containing This Multimedia
		Diagnosis
		Polyps of the Colon and Rectum

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.)