Endoscopic retrograde cholangiopancreatography (ERCP) is an invasive procedure providing radiological visualization of detailed structure and pathological changes in the biliary tree and pancreatic ducts. This widely used accurate imaging modality is usually carried out by injecting contrast agent into the common bile duct (CBD) and the main pancreatic duct (MPD) through papilla located in second part of duodenum, for diagnosing the pancreatobiliary diseases. It is used in an array of conditions as listed in box 1.