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Fisher grade of cerebral vasospasm risk in subarachnoid hemorrhage[1]

Fisher grade of cerebral vasospasm risk in subarachnoid hemorrhage[1]
Group Appearance of blood on head CT scan
1 No blood detected
2 Diffuse deposition or thin layer with all vertical layers (in interhemispheric fissure, insular cistern, ambient cistern) less than 1 mm thick
3 Localized clot and/or vertical layers 1 mm or more in thickness
4 Intracerebral or intraventricular clot with diffuse or no subarachnoid blood
Fisher_SAH_CT_grading_scale.htm
CT: computed tomography.
Reference:
  1. Fisher CM, Kistler JP, Davis JM. Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by CT scanning. Neurosurgery 1980; 6:1.
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