Anomalies and anatomic variants of the biliary tree revealed by MR cholangiopancreatography.

Fig. 1.-Choledochal cyst with anomalous pancreaticobiliary ductal union in 3-year-old girl. A. Single-slice MR cholangiopancreatogram shows choledochal cyst (long arrows) as cystic dilatation of common bile duct Note slightly dilated tortuous pancreatic duct (short arrows). Also note gallbladder(curved arrows), which can be seen through superimposed choledochal cyst B and C, Coronal source images obtamed with respiratory triggering show terminal portion of choledochal cyst with beaklike shape (arrowhead, B) draining into pancreatic duct (arrows, C). D, Fat-suppressed T2-weighted MR image shows small calculi (arrowheads) in choledochal cyst (straight arrows). Note pencholecystic hyperintensity, suggesting acute cholecystitis (curved arrows). Signal intensity of pancreas exceeds that of liver, indicating presence of acute edematous pancreatitis.