Abstract
The patient was a 9 year-old boy with chief complaint of gait disturbance and diplopia, but with no vertigo.Preoperative diagnosis of cerebellar vermis tumor, which had been made by neurological, roentgenological and otological examinations, was confirmed by operation.Otologically examined, Bruns's nystagmus was noted in this case. However, this case differed from cerebellopontine angle tumor in that the main component of Bruns's nystagmus was directed to the normal side, postual nystagmus was directed upward on both sides and there was no marked hearing loss on the affected side.The fact that optic nystagmus is incomplete in its appearance is indicative of the important role of cerebellar vermis or brain stem in the mechanism of gaze.This is a case in which we were deeply impressed with the indispensability of careful examination of postual and optic nystagmus for the differential diagnosis of cerebellopontine angle tumor, thrombosis of cerebellar arteries and other CNS disorders.
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