Chapter 1 Functional Section Editors: Ashwini D. Sharan, MD and Ali Rezai, MDAssistant section editor: Jorge Urquiaga, MD Pain Editorialists: Julie Pilitsis MD, PhD, Milind Deogaonkar MD, Steven M. Falowski, MD, Christopher J. Winfree, MD, FACS, Jason M. Schwalb, MD, FACS, and Erika A. Petersen, MD Movement Disorders Editorialists: Aviva Abosch, MD, PhD, Bradley Lega, MD, and Chengyuan Wu MD MSBmE Epilepsy Editorialists: Jorge Gonzalez Martinez, MD, PhD, Joseph Neimat, MD, MS, Chengyuan Wu MD MSBmE, and Kareem A. Zaghloul, MD, PhD Dystonia Editorialists: Ron Alterman, MD and Bradley Lega, MD Neuropsychiatric disorder Editorialists: Clement Hamani, MD PhD and Bradley Lega, MD Chapter 2 Pediatric Neurosurgery Section Editors: Krystal Tomei, MD, MPH and Gerald Grant, MD, FACS Assistant section editor: Georgios Alexopoulos, MD Craniosynostoses Editorialist: Matthew D. Smyth, MD, FACS, Joanna Kemp, MD and Phuong D. Nguyen, MD Hydrocephalus Editorialists: Maheen Q. Khan, MD, Ramin Eskandari, MD, Ann Marie Flannery, MD, Paul Kanev, MD, Philippe Mercier MD, PhD, and Shenandoah Robinson, MD Pediatric Brain Tumors Editorialists: Raffel Corey, MD, PhD, George I. Jallo, MD, Philippe Mercier MD, PhD, and Lissa C. Baird, MD Spinal Dysraphism Editorialists: Timothy George, MD and Catherine McClung Smith, MD Spasticity Editorialists: David F. Bauer, MD. And M. Burhan Janjua, MD Historical Editorialists: Alan R. Cohen, MD and R. Michael Scott, MD Chapter 3 Peripheral Nerve Section Editors: Robert J. Spinner, MD Entrapment Editorialists: Amgad S. Hanna, MD, Manish Sharma, MB BS, Gavin Davis, MB BS and Michael Biggs, MB BS, FRACS, Eric L. Zager, MD, and Marie-Noelle Herbert-Blouin, MD Tumor Editorialists: Allan D. Levi, MD, PhD, FACS, John E. McGillicuddy, M, Allen M. Maniker, MD and Line Jacques, MD Trauma Editorialists: Justin M. Brown, MD, Rajiv Midha, MD, MSc, FRCS(C), FCAHS, Allan J. Belzberg, MD, Ketan Desai, MS, M.CH, Martjin J.A. Malessy, MD, PhD and Lynda J.-S. Yang, MD, PhD Imaging Editorialists: Michel Kliot, MD and Elias Rizk, MD Historical Editorialists: Allan H. Friedman, MD and Michael J. Dorsi, MD Chapter 4 Spine Section Editors: Zoher Ghogawala, MD and Daniel J. Ho, MD Cervical Degenerative Disease Editorialists: Robert Heary, MD, Vincent Traynelis, MD, Todd Albert, MD and Dan Riew, MD Lumbar Degenerative Disease Editorialists: Daniel Resnick, MD, Paul McCormick, MD, MPH, FACS, Joseph Cheng, MD, Richard Fessler, MD, PhD, Thomas E Mroz MD and John O'Toole, MD, MS Spinal Deformity Editorialists: Sigurd Berven, MD, Frank LaMarca, MD, Lawrence G. Lenke, MD and Praveen V. Mummaneni, MD Spinal Trauma Editorialists: James S. Harrop, MD and R. John Hurblert, MD, PhD, FRCSC, FACS Spinal Tumors Editorialists: Ziya Gokalsan, MD and John Chi, MD, MPH Historical Editorialists: Edward Benzel, MD, Allan R. Martin, BASc, MD, PhD FRCSC and Michael G. Fehlings, MD, PhD, FACS, FRCSC Chapter 5 Trauma Section Editor: Jamie S. Ullman, MD, FACS Spinal Cord Injury Editorialists: Michael Fehlings, MD, PhD and Beverly C. Walters, MD, MSc, FRCSC, James S. Harrop, MD, David Wright, MD, Michael Y. Wang, MD, FACS, David O. Okonkwo MD, PhD, Paul Arnold, MD and Eve Tsai, MD TBI Editorialists: Jam Ghajar, MD, M Ross Bullock, MD PhD, Craig Rabb, MD, FACS, Roxanne Todor, MD, Daniel Michael, MD, PhD, Martina Stippler, MD, Odette Harris, MD, MPH and Donald W. Marion, MD, Alex Valadka, MD, and Shelly Timmons, MD, PhD Historical Editorialists: Roland Torres, MD and Jack Wilberger, MD Chapter 6 Tumor Section Editors: Steven N Kalkanis, MD and Ganesh Rao, MD Primary Brain Tumors Editorialists: Mitch Berger, MD, Mark L. Rosenblum, MD, Manish Aghi, MD, PhD, John Yu, MD, Michael A. Vogelbaum MD, PhD and Sujit S. Prabhu, MD Meningiomas Editorialists: Steven A. Toms, MD, MPH, Daniel Cahill, MD, PhD, Ashok R. Asthagiri, MD, Ed Laws, MD, Franco DeMonte, MD and Ossama Al-Mefty MD Brain Metastases Editorialists: Raymond Sawaya, MD, Douglas Kondziolka, MD, Randy Jensen, MD, PhD, Paul D. Brown, MD, Eric L. Chang, MD and Jason P. Sheehan, MD, PhD Historical: Editorialists: William T. Couldwell, MD, PhD and Jack Rock, MD Chapter 7 Vascular Section Editors: Bernard Bendok R. Bendok, MD and Elad I. Levy, MD Aneurysm and Subarachnoid Hemorrhage Editorialists: Pascal Jabbour, MD, Adam S Arthur, MD, MPH, Carlos A. David, MD, Erol Veznedaroglu, MD, Jacques Morcos, MD and Ricardo A Hanel, MD PhD Carotid and Ischemic Stroke Editorialists: Robert Harbaugh, MD, Andrew J. Ringer, MD, J Mocco, MD, MS, Daniel Surdell, MD, and Rabih G. Tawk, MD Arteriovenous Malformations Editorialists: Daniel L Surdell, MD, B. Gregory Thompson, MD, Kevin Kockroft, MD, and Nick Bambakidis, MD ICH Editorialists: Issam Awad, MD, Judy Huang, MD, Nicholas C Bambakidis, MD and Sepideh Amin-Hanjani MD Historical Editorialists: Hunt Batjer, MD and Daniel Barrow, MD