SpyGlass percutaneous transhepatic cholangioscopy-guided diagnosis of adenocarcinoma of the ampullary region in a patient with bariatric biliopancreatic diversion - Colombi, Davide; Aragona, Giovanni; Bodini, Flavio Cesare; Zangrandi, Adriano; Morelli, Nicola; Michieletti, Emanuele (Hepatobiliary & pancreatic diseases international, 2019)