“…Pure UBN and SN with a predominant upbeat component have been reported in patients with brainstem infarction, brainstem hemorrhage, Wernicke's encephalopathy, multiple sclerosis, tumors, episodic ataxia type 2, cerebellar degeneration, Creutzfeldt-Jakob disease, brainstem encephalitis, epilepsy, Behcet's syndrome, Chiari malformation, meningitis, congenital, vestibular migraine (VM), organophosphate toxicity, tobacco, drugs, canalith jam involving the anterior semicircular canal, Meniere's disease (MD), and delayed endolymphatic hydrops (2)(3)(4)(5)(6)(7)(8)(9)(10)(11). SN with a non-predominant upbeat component has been reported in patients with both central and peripheral lesions, including lateral medullary infarction and medial medullary infarction (12,13), and superior vestibular neuritis (VN) (14)(15)(16).…”