Researching AXIUM Coiling Experience and Recanalization (RACER)

Inclusion Criteria: * Patient or patient's legally authorized representative has signed and dated an Informed Consent Form * Must be at least 18 years of age * Aneurysm location, angio-architecture, morphology, or medical condition, is considered by the neurosurgical / interventional team to be at very high risk for management by traditional operative techniques, or aneurysm is considered to be inoperable * Patient is willing to conduct follow-up visits Exclusion Criteria: * Aneurysm was previously treated * Patient has a cerebral aneurysm with a location, angioarchitecture or morphology that presents an unacceptable risk of morbidity due to the Study procedures * Patient is participating in another clinical research Study * Patient has a medical, social or psychological condition, which precludes the patient from receiving Study required treatment, evaluation, procedures and follow-up * Female patient is pregnant or breast-feeding