Optima Coil Performance in The Interventional Management of Intracranial Aneurysms Registry

Inclusion Criteria: Patients enrolled in this registry must be treated in accordance with the FDA-clearedindication for the Optima Coil System. In addition:

1. Patient age ≥ 18 years;
2. Candidate aneurysm is a previously untreated, saccular intracranial aneurysm measuring ≤ 24 mm in maximal diameter and suitable for embolization with coils;
3. OptimaTM coil system accounts for at least 75% of the total number of implanted coils;
4. Patient/ LARreceived the IRB-approved Consent Information Sheet to augment clinicalprocedure consent, and provided verbal consent to participate in the study
5. Subject willing to comply with the protocol follow-up requirements; and
6. Hunt & Hess classification of equal to or less than 4 for ruptured aneurysms, ifapplicable.

Exclusion Criteria: Since this is a real-world registry, few exclusion criteria are defined. Adjustments forbaseline patient characteristics and aneurysm morphology will be used to identify outliersand unique cohorts.

1. Life expectancy less than 1 year.
2. Patient previously enrolled in the OPTIMA Registry.
3. Known multiple intracranial aneurysms, apart from the targeted aneurysm for the OPTIMAstudy, requiring treatment during the index procedure or within the study follow-upperiod.
4. Patient is unwilling or unable to comply with the protocol follow-up schedule and/orbased on the Investigator's judgment the patient is not a good registry candidate.
5. Participation in another confirmed interventional clinical study that could confoundthe evaluation of this registry, per PI discretion.
6. Pre-planned staged procedures on unruptured target aneurysms