The purpose of this study is to evaluate the safety and effectiveness of the investigational Stryker Citadel Embolization Device for use in the treatment of patients with an aneurysm in the brain. A brain (cerebral) aneurysm is a bulging, weak area in the wall of an artery that supplies blood to the brain.
This device is an investigational device that has not been approved by the U.S. Food & Drug Administration (FDA) for treatment of this type of aneurysm.