What is ERCP? Encoscopic Retrograde Cholangio-Pancreatography (ERCP) is an endoscopic technique to retrograde the pancreaticobiliary duct by injecting a contrast agent through the duodenal papilla and is currently recognized as the gold standard for diagnosing pancreaticobiliary duct disease. On the basis of ERCP, a series of interventions such as duodenal papillary sphincterotomy (EST), endoscopic nasal bile drainage (ENBD), endoscopic internal bile drainage (ERBD), and biliary stone lithotripsy and lithotripsy can be performed, which are popular among patients because they do not require incision, are less invasive, and have shorter hospital stay. The former refers to the diagnostic role of ERCP; the latter refers to the therapeutic ERCP. Which patients need ERCP? It is generally considered that all patients with suspected pancreaticobiliary diseases are indications, mainly including 1. suspected bile duct stones, tumors, inflammation, parasites or obstructive jaundice with unknown causes. 2. Recurrence of symptoms after cholecystectomy or biliary tract surgery. 3.Clinical suspicion of pancreatic tumor, chronic pancreatitis or recurrent pancreatitis in remission. 4.Suspected inflammation of the duodenal papilla or jugular abdomen, tumor or biliary pancreatitis that must be treated by removing the cause. 5.Suspected congenital anomalies such as common bile duct cysts and pancreaticobiliary duct coarctation abnormalities. 6.Understood epigastric pain and suspected pancreaticobiliary disease. 7.Biliary and pancreatic diseases requiring bile and pancreatic fluid collection or Oddi sphincter manometry. 8. Those who need endoscopic treatment for biliopancreatic lesions. What are the advantages of ERCP? 1, minimally invasive, small risk, the treatment are operated through the natural orifice of human body, only a small incision of 0.5cm to 1.0cm in the duodenal papillary muscle, can meet the needs of the operation. 2, less pain, the operation through the duodenoscope, due to the preoperative application of dulcolax, valium and other drugs, the patient overall feel better than gastroscopy. 3.Mature technology, high success rate and few complications. 4, short treatment time, low cost, fast recovery, after the operation can be down to the ground, the next day can resume eating, general treatment can be discharged about a week after the operation, the treatment cost and hospitalization time is 1/2 to 1/3 of the traditional surgery. 5, a wide range of indications, not subject to repeated surgery after the common bile duct adhesions and old and frail restrictions, ERCP technology to reduce the risk of treatment, more conducive to patient recovery.