Figure 2.Multi-planar reformation images (MPR). a. A longitudinal section image of the portal venous system showing heterogeneous enhancement indicating abnormally arterialized veins. b. c. d. Orthogonal images of each part of the portal venous system. The regions of interest showed changes in mean Hounsfield numbers. Note the acute increase in Hounsfield numbers of vessel lumens due to aberrant vascular inflow.