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Fisher Grade The Fisher Grade classifies the appearance of subarachnoid hemorrhage on CT scan: |
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|---|---|---|
| 1 | No hemorrhage evident. | |
| 2 | Subarachnoid hemorrhage less than 1mm thick. | |
| 3 |
Subarachnoid hemorrhage more than 1mm thick. |
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| 4 |
Subarachnoid hemorrhage of any thickness with intra-ventricular hemorrhage (IVH) or parenchymal extension. |
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Reference
Fisher C, Kistler J, Davis J (1980). "Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning". Neurosurgery 6 (1): 1–9.