Summary of specific imaging findings of dissection by technique
| Finding | Internal Carotid Artery (15 vessels total) | Vertebral Artery (10 vessels total) | ||||||
|---|---|---|---|---|---|---|---|---|
| CT only | MRI only | Both CT and MRI | Total | CT only | MRI only | Both CT and MRI | Total | |
| Irregularity | 2 | 0 | 12 | 14 | 4 | 0 | 6 | 10 |
| Pseudoaneurysm | 3 | 0 | 2 | 5 | 1 | 0 | 0 | 1 |
| Flap | 7 | 0 | 0 | 7 | 1 | 0 | 0 | 1 |
| Wall thickening (CT)/crescent sign (MRI) | 1 | 1 | 13 | 15 | 4 | 0 | 5 | 9 |
| Vessel patency | 1 | 0 | 13 | 14 | 2 | 0 | 6 | 8 |
| Acute ischemic stroke | 0 | 3 | 6 | 10* | 0 | 0 | 4 | 5* |
Note:—MRI indicates MR imaging.
* Number of patients, rather than vessels. In the remaining 3 patients, there were multivessel dissections that involved at least 1 of both the ICAs and VAs. In 1 patient, acute ischemic stroke was seen on both MRI and CT, whereas the remaining 2 patients did not show signs of acute ischemic stroke on either technique.