Angiographic characteristics and distribution of DID
| No. (%) | |
|---|---|
| Vessels involved | |
| Anterior circulation only | 4 (16.0) |
| Bilateral ICAs | 4 (16.0) |
| Anterior and posterior circulation | 21 (84.0) |
| Basilar artery + 1 ICA | 10 (40.0) |
| Basilar artery + bilateral ICAs | 5 (20.0) |
| Basilar artery + bilateral ICAs + bilateral MCAs | 2 (8.0) |
| Basilar artery + 1 ICA/ipsilateral M1 | 2 (8.0) |
| Basilar artery + 1 ICA + bilateral MCAs | 1 (4.0) |
| Basilar artery + 1 MCA | 1 (4.0) |
| Mean (SD) maximum diameter of dilated (mm) | |
| Basilar artery | 15.2 (8.3) |
| Internal carotid artery | 12.7 (7.0) |
| MCA | 10.1 (4.3) |
| Thrombus in fusiform/dolichoectatic aneurysm | 7 (28.0) |
Note:—DID indicates diffuse intracranial dolichoectasia.