ERCP (endoscopic retrograde cholangiopancreatography)  is a procedure that allows the physician to diagnose and treat problems in the liver, gallbladder, bile ducts, and pancreas. The procedure combines x-ray and the use of an endoscope -- a  flexible, lighted tube. The scope is swallowed by the patient, and the physician then guides it through the esophagus, stomach, and duodenum. A tube is then passed through the scope and a dye is injected, which will cause the internal organs to appear on x-ray.
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