Magnetic resonance cholangiopancreatography, or MRCP, is a less-invasive alternative to endoscopic retrograde cholangiopancreatography, or ERCP, according to the U.S. National Library of Medicine. ERCP uses an endoscope inserted through the mouth, which travels down the throat, esophagus and stomach to the small intestine.
MRCP is a specialized MRI test that creates detailed images of the liver, bile ducts, pancreas, pancreatic ducts and gallbladder, explains RadiologyInfo.org. ERCP is used to diagnose pancreas and bile duct problems. ERCP treats stones, tumors and narrowed areas of the bile ducts. After the endoscope is inserted through the mouth, a special dye flows through a catheter, which helps the internal imaging.