Positional down beating nystagmus in 50 patients: cerebellar disorders and possible anterior semicircular canalithiasis.


OBJECTIVES To clarify the clinical significance of positional down beat nystagmus (pDBN). METHODS A discussion of the neuro-otological findings in 50 consecutive patients with pDBN. RESULTS In 38 patients there was evidence of CNS disease (central group) but in 12 there was not (idiopathic group). In the CNS group, presenting symptoms were gait, speech… (More)


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