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Cerebral vasospasm is a well known complication of subarachnoid hemorrhage (SAH) and occurs in 46% of patients1 presenting with SAH. Reversible cerebral vasoconstriction syndrome (RCVS) is a separate entity. However, it can present with the classic SAH “thunderclap” headache and carries a risk for delayed ischemic deficits (DID) caused by vasospasm.2 RCVS is characterized by the following; vasospasm on angiography, no evidence of aneurysmal SAH, normal CSF, severe acute headaches with or without neurological …