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Filling defects at CT colonography: pseudo- and diminutive lesions (the good), polyps (the bad), flat lesions, masses, and carcinomas (the ugly) Macari M; Bini EJ; Jacobs SL; Lange N; Lui YWRadiographics 2003[Sep]; 23 (5): 1073-91Numerous filling defects may be detected in the colon during interpretation of data sets obtained with computed tomographic (CT) colonography. A series of 230 patients were evaluated with thin-section multidetector row CT colonography immediately before conventional colonoscopy. In all cases, the interpreting radiologist and gastroenterologist reviewed the imaging findings as well as the results of histologic analysis of biopsy specimens to determine the causes of filling defects. In many cases, the cause of a filling defect can be confidently determined at CT colonography by using combinations of two- and three-dimensional images. However, lesions will occasionally be indeterminate because of overlapping features and will require further evaluation with endoscopy. With knowledge of the morphologic and attenuation characteristics of the various filling defects in the colon, one should be able to differentiate those filling defects detected at CT colonography that require no further evaluation from those that require endoscopic interrogation.|Colonic Diseases/*diagnostic imaging[MESH]|Colonic Neoplasms/*diagnostic imaging[MESH]|Colonic Polyps/*diagnostic imaging[MESH]|Colonography, Computed Tomographic/*methods[MESH]|Diagnosis, Differential[MESH]|Humans[MESH]|Imaging, Three-Dimensional/methods[MESH] |
