Modified Fisher scale

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The modified Fisher scale, or modified Fisher score, is a radiological severity score for aneurysmal subarachnoid hemorrhage (SAH) that has been validated as predictive of cerebral infarction due to vasospasm. It is now widely used to determine the intensity and duration of in-hospital monitoring of these patients.

It can be downloaded as a pdf file:

modified Fisher scale


Dr Shanan Khairi, MD


Claassen J et al., Effect of cisternal and ventricular blood on risk of delayed cerebral ischemia after subarachnoid hemorrhage : the Fisher scale revisited, Stroke, 2001, Sept; 32:2012-20

Fisher CM et al., Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning, Neurosurg, 1980; 6:1-9

Frontera JA et al., Prediction of symptomatic vasospasm after subarachnoid hemorrhage: the modified fisher scale, Neurosurgery, 2006