Subarachnoid hemorrhage - Fisher CT grading scale of subarachnoid bleeding
Fisher CT grading scale is used to grade severity of intracranial subarachnoid hemorrhage associated with rupture of an intracranial aneurysm. This scale predicts the risk of subsequent arterial spasms.
| Group | Description |
|---|---|
| Group I | no hemorrhage |
| Group II | subarachnoid hemorrhage <1mm thick |
| Group III | subarachnoid hemorrhage >=1mm thick |
| Group IV | intracerebral or intraventricular hemorrhage with diffuse or no subarachnoid hemorrhage of any thickness |
References:
1. Fisher CM, Kistler JP, Davis JM. Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning.Neurosurgery. 1980;6:1–9.
2. Meyers PM, Schumacher HC, Higashida RT, Derdeyn CP, Nesbit GM, Sacks D, et al. Reporting Standards for Endovascular Repair of Saccular Intracranial Cerebral Aneurysms. Stroke. 2009 May 1;40(5):e366–e379.
3. Hacein-Bey L, Provenzale JM. Current Imaging Assessment and Treatment of Intracranial Aneurysms. American Journal of Roentgenology. 2011 Jan;196(1):32–44
4. Rosen DS, Macdonald RL. Subarachnoid Hemorrhage Grading Scales. Neurocrit. Care. 2005;2:110-118.