Transendoscopic retrograde cholangiopancreatography (ERCP) is a technique that involves inserting a duodenoscope into the descending duodenum, finding the duodenal papilla, inserting a contrast catheter into the biopsy duct to the opening of the papilla, injecting a contrast agent and then taking x-rays to show the pancreaticobiliary duct. ERCP is popular among patients because it does not require an incision, is less invasive, has a shorter operative time, has fewer complications than surgical procedures, and has a much shorter hospital stay. ERCP allows endoscopic placement of nasobiliary drains (ENBD) for acute septic obstructive cholangitis, bile duct stent drainage, common bile duct stone extraction and other minimally invasive treatments. Indications 1. Jaundice caused by biliary obstruction 2. Clinical, laboratory or imaging tests supporting pancreatic or biliary disorders (e.g. stones, tumors, sclerosing cholangitis, etc.) 3. Pancreatic diseases: pancreatic tumors, chronic pancreatitis, pancreatic cysts, etc. 4. Pancreatitis of unknown origin 5.