ERCP (Endoscopic retrograde cholangiopancreatography) is a technique that combines the use of endoscopy and fluoroscopy to diagnose and treat certain problems of the biliary or pancreatic ductal systems. It is an x-ray examination of the bile ducts which is aided by a video endoscope. Through the endoscope, the physician can see the inside of the stomach and duodenum, and inject dyes into the ducts in the biliary tree and pancreas so they can be seen on x-rays. ERCPs also may be used to help locate pancreas problems. Your stomach must be empty to have this exam, so it is very important that