Evaluation of ONYX in ENDOVASCULAR Treatment of Cerebral AVMs

Inclusion Criteria: * The patient presents a cerebral AVM (not already treated) that can be treated by embolization with Onyx whether or not associated with a cyanoacrylate based adhesive, * The patient is at least 6 years old. Exclusion Criteria: * During the treatment period for his/her cerebral AVM, the patient participates in a study assessing another medical device, another procedure or a drug. * The patient and/or his/her legal representative (if applicable) refuses to give his/her consent to the collection and processing of data required by the centralized follow-up. For patients who refused collection of their personal data, only, the reason for non inclusion and date of implantation will be documented. * Any condition that could prevent follow-up of the patient.