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| Injury grade | Descriptions | Stroke rate (%) | Mortality rate (%) |
|---|---|---|---|
| Grade I | Luminal irregularity with <25% narrowing | 3 | 11 |
| Grade II | Dissection or intramural haematoma with 25% or greater narrowing, intraluminal thrombus or raised intimal flap | 11 | 11 |
| Grade III | Pseudoaneurysm | 33 | 11 |
| Grade IV | Occlusion | 44 | 22 |
| Grade V | Transection with extravasation | 100 | 100 |
