Fig. 2

Imaging of endoscopic retrograde cholangiopancreatography: a ERC shows that the right hepatic duct is ectatic, but the left hepatic duct and part of the common bile duct cannot be seen. There were no stone, but a lump in the common bile duct was observed, which suggested suspicious cholangiocarcinoma. b Two endoscopic retrograde biliary drainages and an endoscopic nasobiliary draingage were placed into the left and right hepatic ducts, respectively, to drain bile