Diagnostic criteria for RCVS
| Criteria |
|---|
| Severe, acute headaches, with or without additional neurologic signs or symptoms |
| Uniphasic disease course with no new symptoms after 1 month of onset |
| No evidence for aneurysmal SAH |
| Normal or near-normal findings on CSF analysis (protein level, <80 mg/dL; leukocyte level, <10/mm3; normal glucose level) |
| Multifocal segmental cerebral artery vasoconstriction demonstrated on either catheter angiography or indirectly on CTA/MRA |
| Reversibility of angiographic abnormalities within 12 weeks after onset. If death occurs before the follow-up studies are completed, postmortem rules out such conditions as vasculitis, intracranial atherosclerosis, and aneurysmal SAH, which can also manifest with headache and stroke |