A colonoscopy is a procedure wherein a trained medical professional examines your rectum and colon using a long, flexible, narrow tube called a colonoscope. This has a light and tiny camera on one end. In addition to polyps and cancer, a colonoscopy can also reveal inflamed and swollen tissue, ulcers, and polyps.
During a colonoscopy, a long, thin, flexible tube is inserted into the large intestine through the rectum and equipped with a camera that displays images on a screen and enables the removal of polyps.
Sigmoidoscopy: An examination of the final third of the large intestine is performed by inserting a thin, flexible tube via the rectum (sigmoid colon).
CT Scan: Using radiation, a medical procedure called a computed tomography (CT) scan creates images of the large intestine.