Mid-term Data Collection of the Treatment of Intracranial Aneurysms With the WEB™ Aneurysm Embolization System

Inclusion Criteria: * Patient is between 18 and 80 years old. * Patient must sign and date the informed consent form \<72hrs post-procedure and prior to data registration. If patient is not able to give informed consent for himself/herself, a legally authorized representative must give informed consent on his/her behalf. * Patient has a ruptured (Hunt and Hess grades 1, 2 or 3) or unruptured intracranial aneurysm requiring endovascular treatment. * Aneurysm with dome-to-neck ratio ≥ 1. Exclusion Criteria: * Aneurysm size unfavourable for WEB implantation (aneurysm width \> 10 mm or aneurysm width \< 3mm). * Patient with Hunt and Hess grades 4 or 5. * Known to be, or suspected of being unable to comply with the study protocol (e.g. no permanent address, known to be non-compliant or presenting an unstable psychiatric history). * Parent vessel occlusion.