Figure 19b.  Normal bile duct in a 46-year-old woman who had undergone orthotopic liver transplantation and primary duct-to-duct anastomosis. (a–c) Multiple MR cholangiograms (a most anterior, c most posterior) are required to show the entire extent of the tortuous bile duct (arrow in a and c). Arrowhead in b indicates the anastomosis. (d) Endoscopic retrograde cholangiogram helps confirm the duct tortuosity and the duct-to-duct anastomosis (arrowhead).