1975 Volume 18 Issue 2 Pages 112-116
Application of the operating microscope to neurosurgery has been making a significant technical advance. Especially it brings a tremendous merits in the operation for acoustic tumor and cerebellopontine angle tumor. And many investigators have reported a good recovery of hearing in these patients after the operation. These patients generally exhibited variable symptoms and clinical data according to intracranial edema, circulatory disturbance or compression by tumor. Even in audiometry, it also exhibited various results depending on the location or the size of the tumor.
From this point of view, 2 cases of the cerebellopontine angle tumor were studied audiometrically on the relationship between the audiometric changes and the development of the tumor.
One deaf patient recovered audiometrically his hearing to normal range in 6 months after the operation of the tumor.
Another patient showed progressive and fluctuating deafness of a few days' duration accompanied with nausea, vomitting and tinnitus. He died of subarachnoidal bleeding after the third severe attack of deafness. Authopsy revealed a thin wall cyst covering cerebellum, pons and medulla. The changes of audiometrical findings were discussed with the pathological data of the tumor.
