Figure 4. Imaging studies of a patient with perihilar cholangiocarcinoma of the left hepatic duct.
Note prominent left hepatic duct dilatation with obstruction of the left hepatic duct system on the CT scan (A), MRI (B), endoscopic retrograde cholangiography (C), and magnetic resonance cholangiography (D); (D) also shows bilateral obstruction of the biliary system at the right and left hepatic bile duct confluence.