腫瘍摘出後，聴覚誘発電位の進行性悪化を示した聴神経鞘腫の1例

Postoperative Deterioration of Auditory Evoked Potentials in Acoustic Neuroma:Report of a Case

はじめに

　両側性小脳橋角部腫瘍の治療では，しばしば聴力温存が切実な問題となる。

　われわれは，手術を契機として聴覚誘発電位が進行性に悪化し，遂には消失した両側性小脳橋角部腫瘍の1例を経験し，聴力温存の観点から示唆に富む所見が得られたので報告する。

Acoustic ncuroma in bilateral cerebellopontine angle regions developed in a patient with von Recklinghausen's disease was removed under mon-itoring auditory evoked potentials. Long term follow up of the auditory evoked potentials of this patient revealed that the amplitudes of auditory evoked potentials were gradually reduced over one and half months and finally disappeared. These electrophysiological findings seemed to be correlated with progression of degeneration of the cochlear nerve fibers that was initiated by mani-pulations in the cerebellopontine angle.