Vascular events Cerebral infarction Arteriovenous malformation Infectious diseases Botulism Epidural abscess Pyomyositis Transverse myelitis Acute flaccid myelitis Poliomyelitis Viral myositis Trichinosis Immunologic diseases Guillain–Barré syndrome Myasthenia gravis Transient neonatal myasthenia Inflammatory diseases Dermatomyositis Polymyositis Trauma Spinal cord concussion Spinal epidural hematoma Fracture, dislocation, transection Birth trauma Toxins Pharmacologic Tick paralysis Heavy metals Marine toxins Snake envenomations Anatomic conditions Atlantoaxial dislocation Chiari malformation/myelomeningocele Tethered spinal cord