MRA and DSA findings with regard to aneurysm location
| MRA Findings | DSA Findings | |
|---|---|---|
| Residual Neck | Complete Occlusion | |
| ICA | ||
| Residual neck | 12 | 1 |
| Complete occlusion | 1 | 26 |
| Percentage | 92.3 (68–99) | 96 (80–99) |
| AcomA | ||
| Residual neck | 18 | 6 |
| Complete occlusion | 1 | 40 |
| Percentage | 94.7 (74–99) | 87 (74–95) |
| ACA | ||
| Residual neck | 1 | 0 |
| Complete occlusion | 0 | 6 |
| Percentage | 100 (3–100) | 100 (5–100) |
| MCA | ||
| Residual neck | 7 | 1 |
| Complete occlusion | 0 | 18 |
| Percentage | 100 (54–100) | 95 (75–99) |
| BA | ||
| Residual neck | 10 | 1 |
| Complete occlusion | 2 | 10 |
| Percentage | 83.3 (52–98) | 90.9 (59–99) |
| PcomA | ||
| Residual neck | 5 | 0 |
| Complete occlusion | 3 | 15 |
| Percentage | 62.5 (18–90) | 100 (79–100) |
| PICA | ||
| Residual neck | 1 | 0 |
| Complete occlusion | 0 | 2 |
| Percentage | 100 (3–100) | 100 (16–100) |
| VA | ||
| Residual neck | 0 | 0 |
| Complete occlusion | 0 | 1 |
| Percentage | 100 (3–100) | |
| Total | ||
| Residual neck | 54 | 9 |
| Complete occlusion | 7 | 118 |
| Percentage | 88.5 (78–95) | 92.9 (87–97) |
Note:—MRA indicates magnetic resonance angiography; DSA, digital subtraction angiography; ICA, internal carotid artery; AcomA, anterior communicating artery; ACA, anterior cerebral artery; MCA, middle cerebral artery; BA, basilar artery; PcomA, posterior communicating artery; PICA, posterior inferior cerebellar artery; VA, vertebral artery. Percentages represent sensitivity (left column) and specificity (right column); figures in parentheses are 95% confidence intervals.