Clinical and radiographic characteristics of bilateral IVADAs with unilateral endovascular treatment
| Case no. | Presentation | Side, PICA-involving, ruptured | Configuration | H-H | Admission mRS score | Treatment | Immediate angiography* | Complication | Follow-up angiography* (months) | Last mRS score (months) |
| 1 | Dizziness | L, no involving, unruptured R, no involving, unruptured | Pearl and string sign Fusiform | – | 1 | SAC – | Near-complete obliteration – | – | Complete obliteration (6) Stable (6) | 0 (6) |
| 2 | Headache | L, no involving, unruptured R, no involving, unruptured | Pearl and string sign Fusiform | – | 2 | SAC – | Near-complete obliteration – | – | Complete obliteration (8) Stable (6) | 0 (8) |
| 3 | Headache | L, no involving, unruptured R, no involving, ruptured | Fusiform Pearl and string sign | Ⅰ | 3 | – SAC | – Near-complete obliteration | – | Stable (3) Stable (3) | 0 (6) |
| 4 | Dizziness | L, no involving, unruptured R, involving, unruptured | Pearl and string sign Pearl and string sign | – | 1 | – SAC | – Near-complete obliteration | – | NA | 0 (6) |
| 5 | Dizziness | L, no involving, unruptured R, no involving, unruptured | Fusiform Pearl and string sign | – | 1 | – SAC | – Near-complete obliteration | – | Stable (6) Complete obliteration (6) | 0 (6) |
| 6 | Dizziness | L, no involving, unruptured R, no involving, unruptured | Pearl and string sign Fusiform | – | 1 | SAC – | Complete obliteration – | – | Complete obliteration (6) Stable (6) | 0 (3) |
| 7 | Incidence | L, no involving, unruptured R, no involving, unruptured | Fusiform Fusiform | – | 0 | SAC – | Complete obliteration – | – | Complete obliteration (6) Stable (6) | 0 (6) |
| 8 | Incidence | L, involving, unruptured R, no involving, unruptured | Fusiform Pearl and string sign | – | 0 | PED alone – | Partial obliteration – | – | Complete obliteration (3) Stable (3) | 0 (3) |
| 9 | Incidence | L, involving, unruptured R, no involving, unruptured | Fusiform Fusiform | – | 0 | PED alone – | Partial obliteration – | – | Complete obliteration (6) Stable (6) | 0 (6) |
| 10 | Incidence | L, no involving, unruptured R, involving, unruptured | Fusiform Fusiform | – | 0 | – PED alone | – Partial obliteration | – | Stable (6) Complete obliteration (6) | 0 (6) |
| 11 | Dizziness | L, no involving, unruptured R, no involving, unruptured | Fusiform Fusiform | – | 0 | PED alone – | Partial obliteration – | – | Complete obliteration (5) Stable (5) | 0 (5) |
*Angiography results are classified as follows: stable, no interval changes of the dissecting aneurysm in size or shape; complete obliteration, complete occlusion of the dissecting aneurysm sac with reconstruction of the parent artery; near-complete obliteration, neck remnant of the dissecting aneurysm, partial resolution, any opacification of the dissecting aneurysm sac.
H-H, Hunt-Hess; IVADAs, intracranial vertebral artery dissecting aneurysms; L, left; mRS, modified Rankin Scale; NA, not applicable; PED, Pipeline Embolization Device; PICA, posterior inferior cerebellar artery; R, right; SAC, stent-assisted coiling.