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Fig. 1. —Illustration of stones in common bile duct as seen on contrast-enhanced CT; appearance of stone can vary depending on slice of examination. On left, dotted lines passing through common bile duct represent scan obtained at each level, and images on right show CT appearance of stones. Slice 1 shows fluid attenuation in lumen of bile duct without stone. Slice 2 shows target sign. Crescent and rim signs are shown at slices 3 and 4, respectively. Slice 5 shows stone completely filling duct. (Modified and reprinted with permission from [10])