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Table 4: Denver grading system, corresponding CTA findings, and grade-based stroke incidence
Grade of Injury Denver Grading System³¹ CTA Findings Stroke Incidence (%)^9,48 (CAI/VAI)
I Irregularity of vessel wall Nonstenotic luminal irregularity 
Dissection or IMH with <25% narrowing Intimal flap or wall thickening with <25% stenosis 3/6
II Intraluminal thrombus Luminal hypodensity 
Dissection or IMH with >25% narrowing Intimal flap or wall thickening with >25% stenosis 14/38
III Pseudoaneurysm Eccentric contrast-filled outpouching limited by periarterial tissue 26/27
IV Occlusion Lack of any intraluminal enhancement 50/28
Carotid occlusions: abrupt or tapered 
Vertebral occlusion: usually abrupt 
V Transection Irregular extravascular collection of contrast, not limited by periarterial tissue 100/100
Increases in density on delayed images, if obtained 
Note:—CAI indicates carotid artery injury; VAI, vertebral artery injury; IMH, intramural hematoma.