Endoscopic retrograde cholangiopancreatography
Endoscopic retrograde cholangiopancreatography (ERCP) uses a dye to highlight the bile ducts. During ERCP, a thin, flexible tube (endoscope) with a camera on the end is gently passed down your throat, through your stomach and into the upper part of your small intestine. Air is used to inflate your intestinal tract so that your doctor can more easily see the openings of your pancreatic and bile ducts. A dye is then injected into the ducts through a small hollow tube (catheter) that's passed through the endoscope. Finally, X-rays are taken of the ducts.