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Endoscopic nasogallbladder drainage (ENGBD) procedure.19a An endoscopic retrograde cholanglopancreatography (ERCP) catheter was inserted in the cystic duct, but the gallbladder was not visualized because of a stone impacted in the neck of the gallbladder. b Through the ERCP catheter, a hydrophilic guidewire was passed beyond the obstruction. c A radiofocus guidewire was inserted into the gallbladder. d An ENGBD catheter was inserted into the gallbladder for drainage
