Contrast enhanced axial CT abdomen of a 46-year-old female illustrates intrahepatic biliary dilatation (dashed black arrows) appearing as linear or tubular and branching low-density areas in the liver. Biliary dilatation in this patient was due to an ampullary tumour which is not seen on the image. Note that normal intrahepatic bile ducts are small in calibre and only faintly seen on CT. They are considered to be dilated when they measure >3mm in diameter. It is important to appreciate normal variation in the calibre of the IVC (white arrow) which can be influenced by inspiratory effort and hydration status. It is also important to appreciate variation in the size and appearance of the stomach (H)