8.The reason for unsuccesful clean out included: accompanied cannular stricture of hepatic duct, aberrance of hepatic duct and inlaid calculi in grade 3 hepatic duct.

• 取石失败的原因为 :合并肝胆管管状狭窄 ,胆管有解剖变异 ,结石位于 3级以上胆管并嵌顿。