Colorectal cancer is the second leading cause of death due to malignancy in industrialized counties. It is argued that most large bowel malignancies arise from preexisting adenormas. Computed tomographic (CT) colonography is a noninvasive, rapidly evolving technique that has been shown in some studies to be comparable with conventional colonoscopy for the screening of colorectal cancer. However, widespread colorectal screening and preventive efforts aimed at detecting disease in this early stage are opposed by several practical obstacles, including limited resources, and poor patient acceptance and therefore poor compliance (1-2).
Patients and methods