Clinical Research Directory

inclusion criteria: * Patients with one or more unruptured intracranial aneurysms followed up at the participating center. Patients may have other ruptured and/or treated aneurysms * Patient older than 18 years * Patient consenting to participate to the study * Patient enrolled in the national healthcare insurance program exclusion criteria: * Patients who have already received surgical or endovascular treatment for all their aneurysm(s), or who are due to receive such treatment in less than 2 months. * Patients with only ruptured aneurysm(s) * Patients with arteriovenous malformations (treated or untreated) * Patients with a contraindication to MRI * Patients with an allergy to one of the contrast agents (Iodixanol, Gadoteric acid) * Pregnant or breast-feeding patients * Patients protected by law.