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Abstract
We report on a case with periodic nystagmus on lateral gaze during vertigo attack. The case is a 19-year-old woman who had repeated vertigo attacks in the early stage of the disease. During remission, she had continuous nystagmus on lateral gaze with a large amplitude. During vertigo attack, she had periodic nystagmus with a small amplitude on lateral gaze with null periods of 8s. At onset, her tentative diagnosis was spinocerebellar degeneration such as dentatorubral-pallidoluysian atrophy because of brain stem tegmentum and cerebellar vermis atrophy identified on MRI, but brainstem encephalitis and cerebellitis couldn't be excluded. Periodic nystagmus during vertigo attack may be induced by the depression of higher neural control which was indicated by lesions in the cerebellar vermis shown on MRI.
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