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Fig. 4A. —46-year-old man with primary sclerosing cholangitis. Endoscopic retrograde cholangiogram reveals multiple strictures of intrahepatic and extrahepatic bile ducts. Strictures of extrahepatic bile duct (arrows) are better shown on ERCP than on MR cholangiopancreatography (B) because of distention produced by infusion of contrast material.