Interest of the T2 * Sequence in MRI for the Diagnosis of Migraine Aura in the Acute Phase.

Inclusion Criteria: * Patients aged 18 to 55 years * Admitted to the Neuro-Vascular Intensive Care Unit for Acute Focused Neurological Symptoms and MRI * less than 4 hours 30 minutes after onset of symptoms if symptoms persist during admission * less than two hours after the disappearance of symptoms if the patient arrives asymptomatic * Affiliated to a social protection scheme. * Having given their informed consent Exclusion Criteria: * Patients with neurological signs pointing to vertebrobasilar localization (vertigo, diplopia) or with a disorder of consciousness * Presence of recent explanatory abnormalities on the MRI to make a diagnosis compatible with the initial neurological symptomatology (visible stroke in diffusion, cerebral hemorrhage, tumor, arteriovenous malformations). * Potential strong cause of stroke known or discovered at the arrival of the patient, in particular stenosis of a cervical or intracranial artery upstream of the cerebral zone may correspond to the symptoms and emboligenic heart disease type atrial fibrillation. * Pregnant women - Patients with a contraindication for MRI. * Patients benefiting from a system of legal protection (tutelage,