Fisher SAH grade
Grade 1: No subarachnoid or intraventricular haemorrhage detected
Grade 2: Diffuse thin (<1 mm) subarachnoid hemorrhage. No clots
Grade 3: Localised clots and/or layers of blood >1 mm in thickness. No intraventricular or parenchymal extension
Grade 4: Intracerebral or intraventricular hemorrhage with diffuse or no subarachnoid hemorrhage
References
Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning. Neurosurgery. 1980 Jan;6(1):1-9
doi:
10.1227/00006123-198001000-00001
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