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Fig. 3B. —56-year-old man with residual intrahepatic lithiasis after having undergone cholecystectomy 2 months previously. Size of calculus is considerable for this site and completely blocks bile duct. Cholangiogram shows T tube exchanged for introducer after passage of guidewire beyond calculus (arrow). Occlusion balloon catheter is inflated so its diameter adapts to size of calculus (arrow). It is pulled gently, but firmly, from below to force calculus to descend into main bile duct.