Frontera 2006 modified Fisher CT grades 0-4 for subarachnoid hemorrhage as assigned from CT by the caller. Returns the published grade and description (0 no SAH or IVH; 1 focal or diffuse thin SAH, no IVH; 2 thin SAH with IVH; 3 thick SAH, no IVH; 4 thick SAH with IVH). Not Fisher 1980 original groups 1-4. Not a diagnosis; magent does not read the CT or invent a millimetre cutoff or vasospasm percentage.

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