Pipeline Embolization for Intracranial Aneurysms

Inclusion criteria: 1. Aged 22 to 75 years old, male or non-pregnant female; 2. UIA was diagnosed by CTA, MRA, or DSA; 3. The size of aneurysms is between 3 to 25mm; 4. Understands the nature of the procedure and provision of written informed consent; 5. Indications for FD implantation with or without adjunctive coiling; 6. Is willing to return to the investigational site for follow-up according to our protocol. Exclusion criteria: 1. With contraindications to flow-diversion treatment or known allergy to cobalt-chromium alloy or contrast medium; 2. Pregnancy or lactation; 3. Coexist with other vascular lesions (coronary artery disease, abdominal aortic aneurysm, severe intracranial artery stenosis, arteriovenous malformation, dural arteriovenous fistula, Moyamoya disease, etc.); 4. Parent vessel with a diameter \<2.0 mm or ≥5.0 mm.; 5. Unwilling to be followed up or likely to have poor treatment compliance; 6. Life expectancy less than 3 years; 7. Inability to receive anti-platelet or anticoagulant medication; 8. Severe neurological deficit that renders the patient unable to live independently (modified Rankin score ≥4); 9. Enrollment in another trial or other situations that the researcher deems unsuitable for inclusion in the study.