Efficacy Trial of Intracranial Aneurysm Treatment Using Two Different Endovascular Techniques

Inclusion Criteria: * At least one documented untreated, unruptured intracranial aneurysm * The intracranial aneurysm is non-thrombosed and non-hemorrhagic * Saccular Carotid Siphon: with a sac diameter of ≥7mm to ≤15mm * Lateral vertebral aneurysms of V4, and side-wall basilar trunk aneurysms * Target aneurysm morphology permits the use of intracranial devices, as determined by the treating physician * Subject greater than or equal to 18 years old * Life expectancy greater than or equal to 12 months * Subject (or subject's legally authorized representative) has provided written informed consent * Subject is willing and able to comply with protocol follow-up requirements Exclusion Criteria: * Subject is under guardianship * Significant atherosclerotic disease, stenosis, tortuosity or other condition preventing microcatheter access to the target aneurysm(s) * Vessel branch arising from the aneurysm sac * Fusiform aneurysm * Ruptured aneurysm * Bifurcation aneurysms (MCA, ACoA) * Recurrent aneurysm * Presence of an intracranial stent on the side that is to be treated * High risk surgical subjects with significant pre-existing co-morbid condition(s), not treated or well controlled with standard therapy * Bleeding disorder which would preclude percutaneous intervention and/or anti-thrombotic therapy; resistance to anti-platelet treatment * Intracranial intervention performed within 30 days prior to the procedure or elective intracranial intervention planned within 12 months following the procedure * Major surgical procedure (e.g., coronary artery bypass graft, valve replacement, abdominal aortic aneurysm repair, bowel resection) performed within 30 days preceding or planned within 12 months following the procedure.