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Fisher grade

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

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