[Preoperative intravenous cholangiography and residual common bile duct calculi. 600 cases reviewed 2 to 15 years after operation].

The authors have carried out as a routine since 1960 before operation a good intravenous cholangiography, i.e. showing up satisfactorily the bile ducts from the bifurcation of the common bile duct to the duodenum and have abandoned routine per-operative radiography.