Fistulous communication of pseudocyst to the common bile duct: a complication of pancreatitis.

A pseudocyst developed in a child following acute pancreatitis and spontaneously drained into the common bile duct, a rare occurrence previously described only in adults. The imaging findings are similar to those of a choledochal cyst; serial sonograms enabled diagnosis by documenting evolution of the lesion and should be of value in demonstrating resolution.