Pictorial Overview of Normal Anatomy Mimics of Disease and Neoplasia at CT Colonography

Joel G. Fletcher and Fargol BooyA

CONTENTS

14.1 Introduction 175

14.2 Intrinsic Features of the Normal Colon 176

14.2.1 Hemorrhoids 176

14.2.2 Diverticulosis 176

14.2.3 Folds 178

14.2.4 Collapse and Contraction 178

14.2.5 Ileo-cecal Valve 181

14.2.6 Inverted Appendiceal Stump and Appendiceal Intussusception 181

14.3 Benign Findings 183

14.3.1 Lipomas 183

14.3.2 Diverticulitis 183

14.4 Intracolonic and Extracolonic Processes Mimicking Disease 183

14.4.1 Stool 183

14.4.2 Fluid 185

14.4.3 Extrinsic Compression 185

14.4.4 Technical Artifacts 185

14.5 Colonic Neoplasia at CT Colonography 185

14.5.1 Polyps 185

14.5.2 Carcinomas 190

14.6 Conclusion 190 References 192

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