Endoscopic retrograde cholangiopancreatography (ERCP) is an endoscopic procedure used to identify the presence of stones, tumors, or narrowing in the biliary and pancreatic ducts. After the endoscope is properly placed, a catheter is advanced which will inject a contrast agent through the ducts. The contrast is visible on X-rays, and allows a physician to evaluate the caliber, length and course of the ducts.
Review Date 7/1/2021
Updated by: Michael M. Phillips, MD, Emeritus Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.