CT Trauma protocols vary from institution to institution but where CTA Thorax is followed by CT Abdomen/Pelvis in portal venous phase, it essentially gives a two-phase study of the upper abdomen, which is very useful in assessing for active bleeding. The upper abdomen should always be carefully examined on CTA Thorax. 

This patient proceeded to angio-embolization with particles, which was effective and hemostasis was achieved.