A magnetic resonance cholangiogram (MRC) is a test that can
help doctors look for problems in the belly. The image is done from outside
the body. No instruments are inserted in the body.
Doctors can use MRC to find
gallstones before surgery to remove the gallbladder
(laparoscopic cholecystectomy). But the test is most useful for diagnosing
complications of gallstones. These include obstruction of the bile duct, perforation
of the gallbladder, and
disadvantage of MRC is that doctors can't use it to remove
gallstones. With ERCP (endoscopic retrograde cholangiopancreatogram), they can.