M. Necmettin Pamir, MD, is Chair and Professor, Department of Neurosurgery, Acibadem University School of Medicine, Istanbul, Turkey. Ossame AI-Mefty, MD, FACS, A Director of Skull Base Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts. Luis A. B. Borba, MD, PhD, IFAANS, is Professor and Chairman, Department of Neurosurgery, Federal University of Parana and Evangelic Medical School, Curitiba, Parana, Brazil.