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| Occluded site in initial noninvasive vascular imaging | Occluded site in DSA | Number of cases |
|---|---|---|
| ICA (n = 77) | ICA (no change) | 70 |
| Proximal M1 | 3 | |
| Distal M1 | 4 | |
| M2 | 0 | |
| Proximal M1 (n = 36) | Proximal M1 (no change) | 17 |
| Distal M1 | 18 | |
| M2 | 1 | |
| Distal M1 (n = 90) | Distal M1 (no change) | 61 |
| M2 | 29 |
ICA: internal carotid artery, M1: M1 segment of middle cerebral artery, M2: M2 segment of middle cerebral artery.
