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Fig. 4C. —45-year-old man with single large stone in common bile duct. Frontal maximum-intensity-pixel-projection reformation of CT cholangiogram. Faceted common bile duct stone is clearly seen (curved arrow) as filling defect but was not diagnosed by radiologists on unenhanced study (A). This is false-negative interpretation of unenhanced helical CT examination. Note metallic clips (straight arrows).