Cerebral aneurysm CT

	Cerebral aneurysm Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] ;Associate Editor(s)-in-Chief: Anika Zahoor M.D.[2]

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Overview

Fisher Grade for Multi Sliced CT scan

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

Grade 1: No hemorrhage evident.
Grade 2: Subarachnoid hemorrhage less than 1mm thick.
Grade 3: Subarachnoid hemorrhage more than 1mm thick.
Grade 4: Subarachnoid hemorrhage of any thickness with intra-ventricular hemorrhage (IVH) or parenchymal extension.

The Fisher Grade is most useful in communicating the description of SAH. It is less useful prognostically than the Hunt-Hess scale.

Images shown below are courtesy of RadsWiki and copylefted.

1. Novitzke J. (2008). The basics of brain aneurysms: a guide for patients. Journal of vascular and interventional neurology, 1(3), 89–90.