Acute cerebellar ataxia is described as a clinical syndrome of acute onset of
cerebellar dysfunction with a good long-term prognosis. The pathogenesis of acute
cerebellar ataxia remains unclear. A 55-year-old woman presented with acute
onset of gait ataxia and dysarthria. The videonystagmography showed saccadic
pursuit and saccadic abnormalities including slightly prolonged latency and
hypometria. Rotational chair test revealed increased vestibuloocular reflex (VOR)
gains and a failure of VOR suppression by visual fixation. Brain magnetic
resonance imaging and cerebrospinal fluid examination were normal. The patient
was treated with steroids and made nearly complete recovery over a period of
3 months.