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Endoscopic retrograde cholangiopancreatography images obtained before treatment. A: There were no abnormalities of the pancreatic ducts; B: Images of the right bile duct showed stricture and simple dilation after a relatively long confluent stricture (arrows), with no strictures of the lower common bile duct (circle); C, D: A band-like stricture was found in the left bile duct (circle), and a beaded appearance was seen from the upper bile duct to the left hepatic duct (arrows).
