Isolated mass-forming IgG4-related sclerosing cholangitis masquerading as extrahepatic cholangiocarc

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BACKGROUND IgG4-related sclerosing cholangitis(IgG4-RSC)is an uncommon benign disease,and its rarer,isolated and mass-forming subtype poses a significant challenge to differential diagnosis from cholangiocarcinoma of the extrahepatic bile duct.We herein r
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