At 26 years old, Karen Jury stood before a class of elementary students as her right arm tingled before falling completely numb. That led to a conversation with her doctor. Years of migraine headaches and a recurring sensation of shock waves throughout her body, simply from the turn of her head, resulted in a scheduled spinal tap and an MRI. She received a diagnosis of Arnold-Chiari malformation, a structural defect in the base of the skull and cerebellum.