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 yearsfollowing 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 inthe 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, flowdiverter).
• 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 contraceptionfor 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.