The following criteria match the FDA-approved indications for use per PMA (P170013)

Subjects treated with the LVIS® Device in accordance with currently approved indications for use;

Treatment of wide-necked (neck ≥ 4mm or dome to neck ratio \< 2) intracranial saccular aneurysm arising from a parent vessel with a diameter ≥ 2.0 mm and ≤ 4.5 mm who underwent treatment with LVIS device of researched sizes within the last 5 years.

(Device models: 212517-LVIS, 212525-LVIS, 213015-LVIS, 213025-LVIS, 213041-LVIS, 214035-LVIS, 214049-LVIS; 212912-LVIS, 212917-LVIS, 212922-LVIS, 212928-LVIS, and 212931-LVIS);

Availability of Medical Health Records;

Subject whose age is ≥ 18;

Appropriate or Waived Consent:

1. For retrospective review: Local Institutional Review Board approves the research as exempt, allowing an all-inclusive retrospective examination of medical records documenting treatments using the study devices and available clinical and imaging follow up;

2. For prospective follow up: Subject or his/her Legally Authorized Representative consents to participation in the study follow up visits up to 5 years, and provides a signed informed consent form as applicable;.

Post-Market Surveillance Study to Evaluate the Long-Term Safety and Effectiveness of the LVIS Device

What this study is about