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To estimate the accuracy of CT colonoscopy in patients with lower GI symptoms who have been referred to the department of radiology from the department of gastroenterology at Sree balaji medical college and hospital, Chennai. To compare the findings obtained from CT colonoscopy with conventional colonoscopy and provide better understanding about the use of CT colonoscopy in regular practice and determine the utility, advantages and limitations of virtual colonoscopy in detection and diagnosis of colonic pathologies. In our study CT colonoscopy 80 % sensitivity of detecting hemorrhoids which was lesser compared to that of conventional colonoscopy. CT colonoscopy detected that 38% of the patients had extra colonic findings of whichthe predominant finding was renal calculi. Patient acceptability was better in our study and there was no need for sedation and analgesics.