Common bile duct lesions-how cholangioscopy helps rule out intraductal papillary neoplasms of the bi

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BACKGROUND Intraductal papillary neoplasm of the bile duct(IPNB)is a rare variant of bile duct tumors,characterized by an exophytic growth exhibiting a papillary mass within the bile duct lumen and it can be localized anywhere along the biliary tree,with
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