Distribution of aneurysm locations
| Site | Group 1 (%) | Group 2 (%) |
|---|---|---|
| ACA | 3 | 1.5 |
| AchoA | <1 | 4.5 |
| AcomA | 37 | 15 |
| AICA | 2 | 0 |
| PCA | 2.5 | 3 |
| BA tip | 4 | 7.5 |
| ICA | 5.5 | 14 |
| MCA | 22 | 44 |
| PcomA | 20 | 9 |
| PICA | 3 | 1.5 |
Note:—ACA indicates anterior cerebral artery (all segments included); AchoA, anterior choroidal artery; AcomA, anterior communicating artery; AICA, anterior inferior cerebellar artery; PCA, posterior cerebral artery (all segments included); BA, basilar artery; ICA, internal carotid artery (supraclinoid portion only; PcomA and AchoA aneurysms are considered separately); MCA, middle cerebral artery (all segments included); PcomA, posterior communicating artery-ICA junction; PICA, posterior inferior cerebellar artery. Bold- face type within each group indicates the first 3 more frequent locations.