This is a case of polytrauma patient suffering from splenic injury due to fractured left lower ribs. The spleen is the most common solid organ injury.

Most splenic pathology is best assessed in the porto-venous phase, because the splenic parenchyma will show homogeneous enhancement in contrast to the arterial phase (where the spleen normally show mosaic enhancement due to difference in the enhancement between the red and white pulps; zebra spleen).  

Always try to search for the cause and associations of the pathology in the available images, many times you will find them (such as the rib fractures here).