Two large, multicenter trials [the American College of Radiology Imaging Network (ACRIN) trial performed in the USA and Italian Multicenter Polyps Accuracy CTC study (IMPACT)trial testing the performance of CTC in comparison with conventional colonoscopy reported that a negative predictive values in both trials for CTC approaching 100%; this is extremely important in order to reassure negative patients about the significance of the examination.The PillCam Colon Capsule Endoscopy (Given® Diagnostic System)offers an alternative approach for endoscopic visualization of the colon in patients with an incomplete conventional colonoscopy. Advantages of the PillCam Colon Capsule Endoscopy (PCCE) include the elimination of the need for sedation, the minimally invasive, painless nature of the exam, no need of X-rays and the ability to pursue normal daily activities immediately following the procedure. Furthermore, PCCE may be well accepted by the subjects, thereby improving subjects' willingness to undergo a second diagnostic evaluation of the colon after the failure of the first endoscopic examination and comply with colorectal cancer screening recommendations. This is a study that is designed to evaluate the performance of the PCCE in the evaluation of patients with an incomplete colonoscopy, compared to the CT-colonography. PCCE and CT-colonography procedures will be compared in regards to completeness of the procedure and detection of lesions in the colon that would have been missed by the incomplete conventional colonoscopy.