A prospective, multicenter, observational assessment of the safety and effectiveness of the LVIS® device in the treatment of wide necked intracranial aneurysms.

Inclusion Criteria:

1. Patient or patient's legally authorized representative has been informed about the confidentiality of the study and has agreed to the collection of his/her personal data

2. Patient has a ruptured or unruptured intracranial aneurysm for which:

   • The parent artery has a diameter ≥ 2.0mm and ≤ 4.5 mm;
   • The aneurysm neck size is ≥ 4mm or its dome-to-neck ratio is < 2 (wide neck)
   • Endovascular treatment with coils and one or more LVIS® devices has been determined necessary for the patient by the multidisciplinary team

3. Patient is aged ≥ 18 years

4. Patient presents with a WFNS score between 0 and 3

5. Patient has agreed to attend follow-up appointments

Exclusion Criteria:

1. The use of an endovascular stent other than LVIS® has been determined necessary
2. Patient presents with medical or surgical co-morbidities limiting his/her life expectancy to less than one year
3. Patient has a contraindication to platelet inhibition treatment
4. Patient requires retreatment of an aneurysm previously treated with a stent
5. Patient is pregnant
6. Patient has multiple aneurysms to be treated in one procedure

Patients aged minimum of 18 years with an intracranial aneurysm in whom stent-assisted coiling has been determined to be the appropriate treatment strategy.