Location of residual stone Location of stone n Rate% Left hepatic duct and further 4 3, 7 Righthepatic duct and further 9 8, 4 Two of hepatic duct and further 11 10, 3 Common bile duct and right hepatic duct 1 0, 9 Segmental duct 2 1, 9 Total 27 25, 2 Comments: Most residual stone was located intrahepatobiliary tract.