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Fig. 9A Congenital variants in asymptomatic adults undergoing routine
colorectal screening. Unenhanced coronal CT image in 42-year-old man with
family history of colon cancer shows malrotation (nonrotation) with air-filled
colon predominately occupying left abdomen and small bowel predominately on
right. Absence of duodenal sweep and reversal of normal superior mesenteric
artery-superior mesenteric vein relationship were evident on other images (not
shown). C = cecum.