Triggers And Risk Factors to Develop a Reversible Cerebral Vasoconstriction Syndrome

Inclusion criteria: * For the Patients * Men and women of 18 and more years old * Taken care in the CHU of Montpellier * Diagnosis of SVCR or SVCR without visible vasoconstriction makes in 14 days preceding the inclusion * According to the consensual criteria of diagnosis and those of the international classification of the headaches ICHD-3 * Informed consent and writes for the participation in the study * For volunteers * Men and women of 18 and more, mated in the Cases on the sex and the age * Patients with an acute pathology not Neurological and not vascular (for example, eye foreign body) OR Healthy Subjects * Informed written consent and for the participation in the study Exclusion criteria: * Coma, insanity, language barrier or severe aphasia preventing from answering the questions * Follow-up considered impossible for 3 months (e.g.: priority associated pathology in the care, the transfer(transformation)) * People placed under legal protection * Refusal to participate in the study