Endoscopic retrograde cholangiopancreatography
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![Fluoroscopic image of common bile duct stone seen at the time of ERCP. The stone is impacted in the distal common bile duct. A nasobiliary tube has been inserted.](/Images/godic/202501/11/ERCP_stone2154.jpg")
![Fluoroscopic image showing dilatation of the pancreatic duct during ERCP investigation. Endoscope is visible.](/Images/godic/202501/11/ERCP_dilatation2154.png")
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Endoscopic retrograde cholangiopancreatography (ERCP) is a technique that combines the use of endoscopy and fluoroscopy to diagnose and treat certain problems of the biliary or pancreatic ductal systems. Through the endoscope, the physician can see the inside of the stomach and duodenum, and inject a contrast medium into the ducts in the biliary tree and pancreas so they can be seen on radiographs.