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.
