Angiographic findingsa
| CTA/MRA Equivalent (No.) | MRA Unique (No.) | CTA Unique (No.) | No. | % | |
|---|---|---|---|---|---|
| Stenosis/occlusion | 30 | 0 | 8b | 38 | 22.4 |
| Aneurysm | 14 | 2 | 0 | 16 | 9.4 |
| Procedural changes | 6 | 0 | 0 | 6 | 3.5 |
| Discrepant angiographicc | 0 | 2 | 0 | 2 | 1.2 |
| Shunting lesion | 1 | 0 | 0 | 1 | 0.6 |
↵a Three cases with angiographic findings had >1 finding.
↵b Three cases of >50% carotid bulb stenosis and 5 cases of proximal vertebral artery stenosis by CTA were outside the FOV of the intracranial MRA.
↵c CTA incorrectly reported 1 case of reversible cerebral vasospasm syndrome and 1 case of aneurysms that were normal findings on subsequent MRA.