Location and sizes of cerebral aneurysms as detected by DSA
| Location | Size Categories | ||
|---|---|---|---|
| Small (≤3.0 mm) | Medium (3.1–5.0 mm) | Large (>5 mm) | |
| ICA | |||
| Infraclinoid | 0 | 0 | 1 |
| Ophthalmic | 0 | 0 | 1 |
| PcomA | 1 | 6 | 2 |
| Carotid-T | 1 | 0 | 0 |
| ACA | |||
| A1 | 0 | 1 | 0 |
| A1/A2 | 5 | 16 | 7 |
| A2 and A3 | 3a | 0 | 3 |
| MCA | |||
| Trifurcation | 4b | 8 | 2 |
| PCA | 0 | 1 | 1 |
| BA | |||
| Oral | 1 | 0 | 3 |
| VA | |||
| PICA | 0 | 3 | 2 |
| V4 | 0 | 0 | 1 |
| All | 15 | 35 | 23 |
Note:—PcomA indicates posterior communicating artery; Carotid–T, intracranial ICA bifurcation; ACA, anterior cerebral artery; A1, A2, A3, segments of the ACA; PCA, posterior cerebral artery; BA, basilar artery; VA, vertebral artery; PICA, posterior inferior cerebellar artery; V4, distal segment of VA.
↵a One aneurysm missed by bone-subtraction CTA.
↵b One aneurysm missed by DSA but detected by bone-subtraction CTA.