CT images of a patient with a periampullary tumor and a dilated biliary tree. The dilated left (LHD) and right hepatic ducts (RHD) are seen at the liver hilum. Corresponding to this, the proper hepatic artery has divided normally into a left hepatic artery (LHA) and right hepatic artery (RHA) at the hilum. This patient also has an accessory right hepatic artery (A-RHA) as a type 6 variant.