Leucoaraiosis and Multimodal MRI With Fingerprinting Technique

Inclusion Criteria: * Patient over 40 years of age * Suffering from leucoaraiosis * Diagnosed via cerebral MRI or CT scan performed by the St Philibert Hospital imaging department For the groups: * incidental LA (patients included in group 1): on the MRI, FLAIR images showed the presence of hyperintense white matter lesions, assessed at a minimum FAZEKAS grade 2+2, the origin of which was related to small artery disease discovered incidentally or during acute management in GHICL's neurovascular intensive care unit. The CT scan revealed hypodense patches of deep periventricular white matter, also of minimal Fazekas grade 2+2. * LA and ischemia (patients included in group 2): on the MRI, FLAIR images show the presence of hyperintense white matter lesions with an extent assessed at a minimum grade of FAZEKAS 2+2: their origin is related to small artery disease discovered during acute management of cerebral ischemia in the GHICL's Neurovascular Intensive Care Unit. * LA and cerebral hemorrhage (patients included in group 3): on the MRI, FLAIR images show the presence of hyperintense white matter lesions of minimal FAZEKAS grade 2+2: their origin is related to small artery disease discovered during the acute management of a cerebral hemorrhage, in the GHICL's Neurovascular Intensive Care Unit. Exclusion Criteria: * Claustrophobia preventing MRI scan * MRI contraindication * White matter lesions with diagnosis not formally established, doubtful, multifactorial or related to a differential diagnosis * Patients with dementia or pathology that precludes longitudinal follow-up * Institutionalized patients * Agitation not allowing MRI to be performed * Pregnant women * Patients under guardianship * Patients objecting the use of their data