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Visual classification: Cerebral vasospasm grades (CVSG).
| Grade 0 | All intracranial vessels show a physiological shape |
| Grade 1 | Vasospasm affects the A2, A1, and M2 segments |
| Grade 2 | Vasospasm expands to the M1 and terminal segment of the internal carotid artery |
| Grade 3 | Severe reduction in the intradural internal carotid artery with filiform A1 and M1 segments, which sometimes appears like a ghost (ghost sign) |
