Aneurysm wall assessment and surgical strategies
| Case | Sex | Location | Morphology | HR-VW MRI Enhancement* | Size (mm)† | Size (mm)‡ | Atherosclerosis | Surgical strategy | mRS before surgery | mRS at last follow-up |
| 15 | Male | P1 | Saccular | Negative | 13.6 | 14.8 | None | Reconstructive clipping | 3 | 0 |
| 16 | Female | VA-PICA | Dissecting | FWE | 15.7 | 16.1 | Atherosclerosis | Aneurysm trapping OA-PICA bypass | 1 | 0 |
| 17 | Female | P1 | Saccular | Negative | 5.0 | 5.1 | None | Direct clipping | 0 | 0 |
| 21 | Female | VA-PICA | Saccular | FWE | 8.2 | 11.4 | Severe atherosclerosis | Aneurysm trapping PICA-VA bypass | 0 | 2 |
| 24 | Male | VA-PICA | Fusiform | FWE | 9.3 | 11.9 | Atherosclerosis, calcification | Aneurysm trapping OA-PICA bypass | 1 | 0 |
| 25 | Female | VA-PICA | Saccular | FWE | 11.2 | 14.5 | Atherosclerosis | Aneurysm trapping PICA-PICA side-to-side bypass | 1 | 0 |
| 26 | Male | P1 | Fusiform | FWE | 37.9 | 41.0 | Atherosclerosis | Aneurysm trapping PICA-PICA side-to-side bypass | 0 | 0 |
| 27 | Male | VA-PICA | Fusiform | FWE | 25.8 | 27.0 | Severe atherosclerosis | Aneurysm trapping PICA-VA bypass | 1 | 0 |
*Negative indicates no wall enhancement; (strong enhancement of only part of the wall).
†Size as measured by DSA.
‡Size as measured by HR-VW MRI.
DSA, digital subtraction angiography; FWE, focal wall enhancement; HR-VW MRI, high-resolution vessel wall MRI; mRS, modified Rankin Scale; OA, occipital artery; PICA, posterior inferior cerebellar artery; VA, vertebral artery.