Endoscopic transpapillary Cholangiography is able to give valuable informations for indication and operative procedure in biliary diseases especially in obstructive jaundice. Indication for "blind" explorative laparotomy seems to become more rare as well as necessity for clearing situations of biliary tract by surgical preparation or X-ray-examinations as usually performed. If one is well trained in technical procedures and in interpretation of radiologic findings, very helpful diagnostic hints can be presented. In opposition to retrograde pancreaticography, endoscopic examination of the biliary tract can be propagated with more enthusism.