1Department of Neurological Surgery, Saint Louis University, St. Louis, Missouri; 2Division of Pediatric Neurological Surgery, Goryeb Children’s Hospital, Morristown, New Jersey; 3Department of Neurosurgery, University of Tennessee Health Science Center, and 4Le Bonheur Children’s Hospital, Memphis, Tennessee; 5De part ment of Pediatric Neurosurgery, Massachusetts General Hos pital, Boston, Massachusetts; 6Department of Neurological Sur gery, Oregon Health & Science University, Portland, Oregon; 7De part ment of Pediatric Neurological Surgery, Children’s Hos pital of Pittsburgh, University of Pittsburgh, Pittsburgh, Pennsylvania; 8Division of Pediatric Neurosurgery, Department of Neurological Surgery, Washington University School of Medicine, St. Louis, Mis souri; 9Department of Neurosurgery, University of Illinois at Chicago, Chicago, and Advocate Children’s Hospital, Oak Lawn, Illinois; 10Division of Pediatric Neurological Surgery, Department of Neurosciences and Pediatrics, Goryeb Children’s Hospital– Morris town Medical Center, Morristown, New Jersey; 11De partment of Neurosurgery, University of California, San Francisco, Cal i fornia; 12Departments of Radiology, Ophthalmology, and Neuro sur gery, University of Tennessee Health Science Center, Mem phis, Tennessee, and Le Bonheur Neuroscience Institute, Le Bon heur Children’s Hospital, Memphis, Tennessee; 13Guidelines Department, Congress of Neurological Surgeons, Schaumburg, Illinois; and 14Hydrocephalus Association, Bethesda, Maryland