Selection of Patients for Treatment of Brain Arteriovenous Malformations by the Transvenous Approach: Relationship with Venous Anatomy and Risk of Hemorrhagic Complications ============================================================================================================================================================================ * J.M.B. De Sousa * C. Iosif * L.Z. Sganzerla * A.N. Rafie * V. Borodetsky * A. Rouchaud * S. Saleme * C. Mounayer