Endoscopic retrograde cholangiopancreatography (ERCP)'s 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 dyes into the ducts in the biliary tree and pancreas so they can be seen on x-rays. ERCP's used primarily to diagnose and treat conditions of the bile ducts, including gallstones, inflammatory strictu… (More on Ercp)