Computed tomographic colonography, i.e. CT colonography has already widely replaced double-contrast colonography as a method of examination of the colon. A prerequisite of successful examination is a well-emptied and distended colon. CT colonography detects cancer with a sensitivity of 96%, which corresponds to the results of colonoscopy. Furthermore, CT colography allows the simultaneous assessment of the extracolonic organs in the abdominal cavity. The risk of bowel perforation is smaller than in conventional colonoscopy, and for the patient the CT examination is more convenient than conventional endoscopy or double-contrast colonography.