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Figure 25b.   Choledocholithiasis in a 7-year-old boy with right upper quadrant pain and jaundice. (a) Oblique sonogram of the porta hepatis shows dilatation of the common hepatic (CHD) and common bile ducts (CBD). There was also mild dilatation of the intrahepatic bile ducts. (b)Transverse sonogram of the pancreas (P) and gallbladder (GB) demonstrates an obstructing stone (arrow) in the distal most part of the common bile duct.