Sigmoidoscopy's the minimally invasive medical examination of the large intestine from the rectum through the last part of the colon. There're two types of sigmoidoscopy, flexible sigmoidoscopy, which uses a flexible endoscope, and rigid sigmoidoscopy, which uses a rigid device. Flexible sigmoidoscopy's generally the preferred procedure. A sigmoidoscopy's a very effective screening tool. A sigmoidoscopy's similar but not the same as a colonoscopy. A Sigmoidoscopy only examines up to the sigmoid,… (More on Sigmoidoscopy)