Modified Fisher (Claassen) subarachnoid hemorrhage CT rating scale

Grade	Head CT criteria
0	No SAH or IVH
1	Minimal SAH and no IVH
2	Minimal SAH with bilateral IVH
3	Thick SAH (completely filling one or more cistern or fissure) without bilateral IVH
4	Thick SAH (completely filling one or more cistern or fissure) with bilateral IVH

CT: computed tomography; SAH: subarachnoid hemorrhage; IVH: intraventricular hemorrhage.

From: Claassen J, Bernardini GL, Kreiter K, et al. Effect of cisternal and ventricular blood on risk of delayed cerebral ischemia after subarachnoid hemorrhage: the Fisher scale revisited. Stroke 2001; 32:2012.

Graphic 57558 Version 5.0

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