Abstract
Spontaneous abnormal eye movements are frequently caused by disease in the aqueduct of the midbrain and indicate the location of the lesion the at an early stage.We report here a case of Sylvian aqueduct syndrome in which neuro-otological findings became clues to the diagnosis. Our patient was a 54-year-old male with the chief complaint of unstable dizziness. He showed intermittent convergence nystagmus and upward gaze palsy. Hydrocephalus following non-tumoral aqueduct stenosis resulted in a lower inclination of the brainstem and caused such ocular symptoms. Structural changes could not be demonstrated in images at an early stage. Oculomotor abnormalties changed after a V-P shunt was placed and eventually disappeared.
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