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| Artery of origin | Number of patients (% of total) |
|---|---|
| Anterior comunicating | 22 (42.3) |
| Posterior communicating | 15 (28.8) |
| Middle cerebral | 5 (9.6) |
| Terminal internal carotid | 4 (7.7) |
| Ophthalmic | 2 (3.9) |
| Supraclinoid internal carotid | 1 (1.9) |
| Multiple locations | 1 (1.9) |
| Basilar tip | 2 (3.9) |
