Principles of neurological surgery / Richard G. Ellenbogen, MD, FACS, Professor and Chairman, Theodore S. Roberts Endowed Chair, Department of Neurological Surgery, University of Washington, Seattle, Washington, Laligam N. Sekhar, MD, FACS, FAANS, Professor and Vice Chairman, Neurological Surgery, Harborview Medical Center, University of Washington, Seattle, Washington, Neil D. Kitchen, MD, FRCS (SN), Consultant Neurosurgeon, National Hospital for Neurology and Neurosurgery, Queen Square, London, United Kingdom ; assistant editor, Harley Brito da Silva, MD, Department of Neurological Surgery, Harborview Medical Center, University of Washington, Seattle, Washington.