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The Fisher grading scale classifies the appearance of subarachnoid hemorrhage on CT scan and is used in predicting cerebral vasospasm.
The development of clinical vasospasm within each grade has been reported as follows:
References
Fisher CM, Kistler JP, Davis JM. Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning. Neurosurgery. 1980 Jan;6(1):1-9.
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