Pica aneurysm features and microsurgical strategies (n=29)
| Surgical strategy | Morphology | Group | Change in mRS* | Bypass patency | ||||
| Saccular | Non- Saccular | Proximal (VA-PICA, P1-P3) | Distal (P4-P5) | Improved | Same | Worse | ||
| Direct or reconstructive Clipping | 16 | 3 | 9 | 10† | 15 | 2 | 0 | -- |
| IC-IC bypass | 2 | 5 | 7 | 0 | 4 | 2 | 1 | 7/7 |
| EC-IC bypass | 1 | 2 | 3 | 0 | 2 | 1 | 0 | 3/3 |
*Change in mRS score was evaluated by comparing follow-up score with the preoperative score for each patient, n=27
†Includes case 17, which was directly trapped by parent artery clipping
EC-IC, extracranial–intracranial; IC-IC, intracranial–intracranial; mRS, modified Rankin Scale; PICA, posterior inferior cerebellar artery; VA, vertebral artery.