Additional points
Advance one grade for multiple injuries up to grade III
"vascular injury" (i.e. pseudoaneurysm or AV fistula) - appears as a focal collection of vascular contrast which decreases in attenuation on delayed images
"active bleeding" - focal or diffuse collection of vascular contrast which increases in size or attenuation on a delayed phase
The AAST guidelines recommend dual arterial/portal venous phase imaging for evaluation of a vascular injury of liver, spleen, or kidney.
Radiopaedia Figures (click to open in new tab)
* Case courtesy of Dr Sachintha Hapugoda, Radiopaedia.org. From the case rID: 51390