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portoenterostomy por·to·en·ter·os·to·my (pôr'tō-ěn'tə-rŏs'tə-mē)
A surgical procedure for the treatment of biliary atresia in which a Roux-en-Y anastamosis is connected to the hepatic end of the divided extravascular portal structures, including the rudimentary bile ducts. Also called Kasai operation.