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Fig. 1B. —38-year-old man with primary sclerosing cholangitis. MR cholangiopancreatogram shows multiple strictures (arrows) in intrahepatic bile duct that could not be seen on ERCP (A) because intrahepatic ducts were not opacified. Signal voids at left and right central intrahepatic ducts represent high-grade strictures responsible for inability to opacify ducts on ERCP. In addition, although strictures of extra-hepatic bile duct (arrowheads) are shown, they are better visualized on ERCP because of distention of duct by contrast material.