Triggers And Risk Factors to Develop a Reversible Cerebral Vasoconstriction Syndrome

"We are collecting additional blood and CSF samples for patients (during RCVS episode and after resolution of RCVS episode) and for control subjects to constitute a biobank, in order to compare different biologic parameters between RCVS patients and healthy volunteers. A specific agreement will be asked to patients and control subjects before collection of samples.~This is why this study is classified as 'interventional' rather than 'observational'."