Coated Mongolian Aneurysm Treatment Study 1

Inclusion Criteria: * At least one unruptured sidewall aneurysm in the anterior circulation * No implant (e.g., stent) in the target vessel segment * Age \>18 years and \<80 years * Not pregnant and in women of childbearing age, on oral contraception for two years following the procedure * No participation in another trial * No concomitant disease limiting the life expectancy to \<2 years * No allergy to non-ionic contrast medium or to ASA and P2Y12 receptor antagonists * No other neurovascular disorder in the same vascular territory requiring treatment in the foreseeable future * Ability and willingness to comply with the medication requirements within the study, * Ability to understand the goal and risks of this study. Exclusion Criteria: * Intracranial aneurysm considered not suitable for FD using p64 MW HPC or p48 MW HPC. * Aneurysm previously treated with a device in the parent vessel (e.g., stent, flow diverter). * Another intracranial procedure scheduled for the following 6 months. * Age \< 18 years and \> 80 years. * Pregnancy possible or confirmed. Patient not able or willing to arrange contraception for 12 months after treatment. * Patient not able or willing to adhere to the study protocol. * Patient not able or willing to undergo the scheduled follow-up examinations.