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Potential Etiologies of Spontaneous SAH
| Cerebral aneurysm |
| Perimesencephalic |
| Isolated convexity |
| Vascular malformations (arteriovenous malformations/AVF) |
| Arterial dissection |
| Cerebral amyloid angiopathy |
| Moyamoya |
| Vasculitis (PRES, RCVS, lupus) |
| Coagulopathy (thrombocytopenia, anticoagulation) |
| Sickle cell disease |
| Hypertension |
| Sympathomimetic drugs |
