Case files. / Eugene C. Toy, MD (Vice Chair of Academic Affairs and Residency Program Director, Department of Obstetrics and Gynecology, Houston Methodist Hospital, John S. Dunn Sr. Academic Chair of Obstetrics and Gynecology, St. Joseph Medical Center, Houston, Texas, Clerkship Director and Clinical Professor, Department of Obstetrics and Gynecology, University of Texas Medical School at Houston, Houston, Texas), Evan Yale Snyder, MD, PhD (Professor and Director, Center for Stem Cells & Regenerative Medicine, Stanford-Burnham Medical Research Institute, Department of Pediatrics, University of California-San Diego, La Jolla, California), Josh Neman, PhD (Assistant Professor, Research, Department of Neurological Surgery, Keck School Medicine, University of Southern California, Los Angeles, California, formerly: Resarch Fellow, Division of Neurosurgery, City of Hope Comprehensive Cancer Center, Beckman Research Institute, Duarte, California ), Rahul Jandial, MD, PhD (Assistant Professor, Neurosurgery, City of Hope Comprehensive Cancer Center, Beckman Research Institute, Duarte, California).