Clipping of bilateral supply to a midline ethmoidal dural arteriovenous fistula at the origin of the superior sagittal sinus using a bifrontal approach oleh Roberto Rodriguez Rubio, MD, Ricky Chae, BA, W. Caleb Rutledge, MD, Vera Vigo, MD, Ethan Winkler, MD, PhD, Ioannis Kournoutas, BS, Adib A. Abla, MD