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Biffl scale for blunt cerebrovascular injury.
| Injury grade | Description |
|---|---|
| 1 | Luminal irregularity or dissection with <25% luminal narrowing |
| 2 | Dissection of intramural hematoma with >25% luminal narrowing, intraluminal |
| 3 | Pseudoaneurysm |
| 4 | Occlusion |
| 5 | Transection with free extravasation, hemodynamically significant arteriovenous fistulae |
