Table 4:

Denver grading system, corresponding CTA findings, and grade-based stroke incidence

Grade of InjuryDenver Grading System31CTA FindingsStroke Incidence (%)9,48 (CAI/VAI)
IIrregularity of vessel wallNonstenotic luminal irregularity
Dissection or IMH with <25% narrowingIntimal flap or wall thickening with <25% stenosis3/6
IIIntraluminal thrombusLuminal hypodensity
Dissection or IMH with >25% narrowingIntimal flap or wall thickening with >25% stenosis14/38
IIIPseudoaneurysmEccentric contrast-filled outpouching limited by periarterial tissue26/27
IVOcclusionLack of any intraluminal enhancement50/28
Carotid occlusions: abrupt or tapered
Vertebral occlusion: usually abrupt
VTransectionIrregular extravascular collection of contrast, not limited by periarterial tissue100/100
Increases in density on delayed images, if obtained
  • Note:—CAI indicates carotid artery injury; VAI, vertebral artery injury; IMH, intramural hematoma.