Possible errors with the reference standard modality, DSA
| Patient No. | Occlusion Location at DSA | Stenosis Location at CTA | Probable DSA Error |
|---|---|---|---|
| 3 | Vertebral | Vertebral | False-positive |
| 4 | Vertebral | Vertebral | False-positive |
| 20 | Basilar | Basilar | False-positive |
| 22 | Basilar | Basilar | False-positive |
| 24 | Basilar | Basilar | False-positive |
| 28 | Basilar | Basilar | False-positive |