Assessment of the Clinical and Economic Impact of Sim&Size, a Simulation Software for Implantable Devices Used in the Treatment of Intracranial Aneurysms: A Prospective Multicenter Study.

Inclusion Criteria: * Patients aged ≥18 years planned to be treated endovascularly for unruptured intracranial aneurysms. * Planned implantable device models is available in the Sim\&Size simulation database and used following their approved indications. * Affiliated with the French social security system. * Signed the information and consent form Exclusion Criteria: * Patients scheduled to undergo endovascular treatment with stents only * Patients presenting for treatment of a ruptured aneurysm * Patients who have already been treated in the planned deployment area and whose previous treatment presents a potential contact with the new implant. * Giant intracranial aneurysm resulting in poor-quality reconstruction in the potential deployment area of the implant during 3DRA acquisition * Presence of artifacts on the 3DRA in the potential deployment area of the implant * Patients with multiple aneurysms whose treatment is planned during a single procedure and who require separate individual therapeutic strategies. Examples of individual therapeutic strategies excluded from the study: placement of two separate flow diverters without telescopic technique, individual coiling of each aneurysm. * Patients for whom pre-planning was performed using Sim\&Cure software prior to patient randomization. * Pregnant or breastfeeding women. * Patients under guardianship or conservatorship. * Emergency situations.