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| Grade | Definition |
|---|---|
| Grade 1 | Minor intimal irregularity or dissection with less than 25% luminal narrowing |
| Grade 2 | Dissection with intramural hematoma resulting in greater than 25% luminal narrowing |
| Grade 3 | Pseudoaneurysm |
| Grade 4 | Arterial occlusion |
| Grade 5 | Transection with extravasation |
Source: Adapted from Biffl et al. 6
