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Fisher Grade

The Fisher Grade classifies the appearance of subarachnoid hemorrhage on CT scan:

1No hemorrhage evident.
2Subarachnoid hemorrhage less than 1mm thick.

Subarachnoid hemorrhage more than 1mm thick.


Subarachnoid hemorrhage of any thickness with intra-ventricular hemorrhage (IVH) or parenchymal extension.



Fisher C, Kistler J, Davis J (1980). "Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning". Neurosurgery 6 (1): 1–9.

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