ABSTRACT
CT colonography is increasingly being used in the detection of colorectal cancer. Whilst it has been shown to be extremely useful when colonoscopy and barium enemas have failed, its exact role in screening is still being determined. Due to its non-invasive nature, CT colonography is more acceptable to patients as a screening tool than colonoscopy which has a poor voluntary uptake (2). For many patients, a screening colonography is all that is required to exclude colonic pathology. If a colonic lesion is found, then further investigation with colonoscopy may be required to assist in establishing the diagnosis or to implement treatment of the primary pathology in the case of a colonoscopically resectable adenoma. CT colonography has the additional benefit of allowing examination of the extra-colonic intra-abdominal organs (3). The national screening program in the United Kingdom, however, is utilizing fecal occult blood testing and colonoscopy (4).
