Case files. / Eugene C. Toy, MD, Assistant Dean for Educational Programs, Director, Doctoring Courses, Professor and Vice Chair of Medical Education, Department of Obstetrics and Gynecology, McGovern Medical School at University of Texas Science Center (UTHealth) at Houston, Houston, Texas, Barry C. Simon, MD, Chairman, Department of Emergency Medicine, Alameda Health System/Highland General Hospital, Oakland, California, Clinical Professor of Emergency Medicine, University of California, San Francisco, California, Katrin Y. Takenaka, MD, Associate Professor, Associate Residency Program Director, Department of Emergency Medicine, McGovern Medical School at University of Texas Science Center (UTHealth) at Houston, Houston, Texas, Terrence H. Liu, MD, MPH, Physician and Surgeon, Sutter East Bay Medical Group, Berkeley, California, Adam J. Rosh, MD, MS, Assistant Professor, Department of Emergency Medicine, Wayne State University School of Medicine, Detroit Receiving Hospital, Detroit, Michigan.