A minimally invasive medical examination of the large intestine from the rectum through the last part of the colon is called Sigmoidoscopy. There are two types of Sigmoidoscopy, flexible Sigmoidoscopy, which uses a flexible Endoscope, and rigid Sigmoidoscopy, which uses a rigid device. Flexible Sigmoidoscopy is generally the preferred procedure. A Sigmoidoscopy only examines up to the sigmoid, the most distal part of the colon, while Colonoscopy examines the whole large bowel. Also used to finding the abnormalities of the large intestine, leading abnormal growth, polyps etc. and used for taking biopsy.