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Fig. 1B Biliary calculi in asymptomatic adults undergoing routine colorectal
screening. Unenhanced transverse CT images in 68-year-old woman show
cholelithiasis (arrowhead, B) and choledocholithiasis
(arrow, C). There was mild biliary ductal dilatation and there
were additional common duct stones (not shown) but no clinical symptoms or
elevated bilirubin.