Figure 18a.  Isolated duct obstruction in an 18-year-old woman who sustained bile duct transection during laparoscopic cholecystectomy. The transection was repaired with a duct-to-duct anastomosis. (a) MR cholangiopancreatogram reveals a stricture (arrow) of the left hepatic duct and proximal ductal dilatation (arrowhead). (b) T-tube cholangiogram shows incomplete filling of the dilated left hepatic duct (arrowhead) and a partially retracted T tube (arrow). Note the surgical clips adjacent to the duct.