不全型saccadic nystagmusの1例

概要

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Atypical saccadic nystagmus was observed preoperatively (prior to reoperation) in a patient with recurrent neurinoma of the left acoustic nerve. The eye movements were identical with those described by Alpert et al as saccadic nystagmus in amplitude (2 to 4 degrees), frequency (2 to 3Hz) as well as in the fact that they are fixation-induced, continuous, conjugate-horizontal, square wave-like oscillations of both eyes, the only difference being that they are elicited only with upward gaze. Postoperatively, these oscillatory movements of the eyes disappeared and at the same time marked improvement of trunk ataxia was noted. Other neurological findings (left-sided cerebellar hemiataxia, gaze nystagmus, a disturbance of horizontal optokinetic nystagmus and of horizontal smooth following eye movements and symptoms of left cranial nerve involvement) remained unimproved or even worsened after operation. A lesion responsible for the occurrence of saccadic nystagmus is thus suggested to be located in the cerebellar vermis in the present case.
社団法人日本耳鼻咽喉科学会の論文