Currently, there are two main indications for CT colonography (CTC). First, polyp detection, in patients with an increased risk for colorectal cancer, or in asymptomatic patients, with an average risk, for screening purposes. The second common indication is incomplete or failed colonoscopy, where CT colonography is useful for complete colon visualization; for example, to detect additional lesions proximal to a stenotic cancer (Morrm et al. 1999; Macari et al. 1999). In addition to these main indications, there are several other conditions where the role of CT colonography is not yet clearly defined. Some of these conditions may lead to colon obstruction, in which case CTC is performed after incomplete colonoscopy. However, CTC may also be used for surveillance of these conditions, per se, as an alternative to colonoscopy or barium enemas. Diver-ticular disease is the most common colonic disease in the Western world and often leads to diverticuli-tis. CTC is helpful in the assessment of not only the lumen, but also any extramural changes (Table 13.1). At chronic stages of inflammatory bowel diseases, CT colonography can provide information about the extent of the disease and about stenosis and preste-

T. Mang, MD; W. ScHiMa, MD; A. MaiER, MD; P. Pokieser, MD Department of Radiology, Medical University of Vienna, Waehringer G├╝rtel 18-20, 1090 Vienna, Austria

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