Neuro-Ophthalmologic Emergencies in Movement Disorders

Segment 1. Opsoclonus. A 42-year-old man with no past medical history presented to the emergency department with acute-onset dizziness, shakiness, and oscillopsia. Examination revealed opsoclonus, head titubation, and truncal myoclonus. Brain magnetic resonance imaging (MRI) with contrast, cerebrospinal fluid (CSF) analysis, paraneoplastic antibody panel, and co-registered body positron emission tomography-computed tomography (PET-CT) scan were unremarkable. Infectious and immune serologies were unremarkable. He was treated empirically with intravenous immunoglobulin (IVIG) and gradually recovered fully over 3 months. The working diagnosis