Diagnostic criteria for RCVS4
| Criteria | |
|---|---|
| 1 | Unusual, acute severe headache of progressive or sudden onset, presenting with or without neurologic focal deficit and/or seizure |
| 2 | Benign CSF analysis (protein level, <80 mg/dL; leukocyte count, <10/mm3; and normal glucose level) |
| 3 | Imaging studies demonstrating 2 different points of vessel narrowing in at least 2 different intracranial arteries |
| 4 | Imaging proving absence of intracranial aneurysm/vascular malformation or aneurysmal SAH |
| 5 | Reversibility of intracranial vessel narrowing on short-term follow-up evaluation (<12 months) |