Percutanous extraction of residual biliary tract stones through T-tube tract was established as a success-ful and generally accepted radiologic procedure in patients with post-operative retained stones. Percutaneous removal of residual stones was performed in 43 patients at the Department of Radiology, Seoul National University Hospital from November, 1982 to August, 1984 The results were as follows: 1. Location of residual stones are intrahepatic in 29 cases (67.4%) extrahepatic in 11 cases (25.6%) and combined in 3 cases. 2. Number of residual biliary stones was single in 14 cases and 2 to 10 stones in 17 cases. 12 patients had more than 10 stones. 3. Success rate was 100% in extrahepatic stones and 68.9% in intrahepatic stones. Overall success rate was 76.7% 4. There was no significant complication of this method.