Sub arachnoid hemorrhage consecutive to intracranial aneurysm rupture is a devastating disease. Predictors of intracranial aneurysm rupture are limited and focus mainly on size and location. Platelet activation may have a deleterious role on aneurysm rupture. The assumption is that patients with ruptured intracranial aneurysm will present a higher rate of platelet activation compared to patients with non ruptured aneurysms.

Inclusion Criteria:

• Patient aged 18 and over
• Patient presenting a single or multiple aneurysm
• Patient presenting an intracranial aneurysm for which an intervention is planned (endovascular treatment or surgery) : elective intervention for an unruptured aneurysm or emergency surgery for a broken aneurysm

Exclusion Criteria:

• Pregnant or breast feeding woman
• Patient benefiting from legal protection measures

Adult patients presenting a single or multiple intracranial aneurysm for which an intervention is planned (endovascular treatment or surgery)