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 Health Science Center (UTHealth) at Houston, Houston, Texas, Ericka Simpson, MD, Associate Professor, Neurology Weil-Cornell Medical College, New York Co-Director MDA Neuromuscular Clinics and Director of ALS Clinical Research Division Methodist Neurological Institute Program Director, The Methodist Hospital Neurology Residency & Neuromuscular Fellowship, Houston, Texas, Pedro Mancias, MD, Professor Assistant Dean, Diversity and Inclusion Assistant Dean, Student Affairs and Admissions Distinguished Teaching Professor, Adriana Blood Professor of Pediatrics, McGovern Medical School at University of Texas Health Science Center (UTHealth) at Houston, Houston, Texas, Erin E. Furr-Stimming, MD, Associate Professor of Neurology, Chief of Neurology, LBJ Hospital Director, Neurology Clerkship Director, Huntington's Disease Society of America Center of Excellence McGovern Medical School at University of Texas Health Science Center (UTHealth) at Houston, Texas.