Study to Evaluate Cerebral AneurysmFlow Results in Occlusion

Inclusion Criteria: * Subject with unruptured, ≥5mm saccular aneurysm(s) located in the anterior intracranial circulation and suitable for an endovascular treatment with a Flow Diverter Stent * Subject is 18 years of age or older, or of legal age to give informed consent per state or national law. * Subject is available for clinical follow-ups. Exclusion Criteria: * Non-saccular brain aneurysm(s) (i.e. dissecting, fusiform, atherosclerotic, mycotic, bifurcational). Prior aneurysm treatment with either endovascular (stenting, coiling) or surgical (clipping) techniques. * Endovascular treatment assisted with coils or intracranial stents * Significant or severe allergy to intra-arterial contrast medium uncontrolled by pre-procedure medications. * Severe kidney disease (Glomerular Filtration Rate \< 60). * Subjects not willing (or able) to attend post FDS insertion standard-of-care follow up clinic visits requiring DSA, head MRI or CTA imaging. * Subject participates in a potentially confounding drug or device trial during the course of the study. * Subject meets an exclusion criteria according to national law (e.g. age, pregnant woman, breast feeding woman).