ERCP (endoscopic retrograde cholangio-pancreatography) is a technique that combines the use of endoscopy and fluoroscopy to depict the biliary and pancreatic ductal systems. It is necessary for the diagnosis and treatment of gall stones and diseases of the pancreas. Through a special endoscope (side-view duodenoscope) a contrast agent is injected into the biliary and/or pancreatic ducts so they can be documented using X-rays. Gall stones can be removed by trawling the common bile duct with a basket. Constrictions and stenosis in the bile or pancreatic ducts can be bridged through insertion of a plastic- or self-expanding metall stent. This examination is always done under sedation and requires a short hospital stay.