Sigmoidoscopy

A flexible sigmoidoscopy is an exam used to evaluate the lower part of the large intestine (colon). During a flexible sigmoidoscopy exam, a thin, flexible tube (sigmoidoscope) is inserted into the rectum. A tiny video camera at the tip of the tube allows the doctor to view the inside of the rectum, the sigmoid colon, and most of the descending colon just under the last 2 feet (about 50 centimeters) of the large intestine.