聴神経腫瘍の臨床的研究(その2)

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4. As regards the vestibular examination of the patients with acoustic tumor, spontaneous nystagmus was present in 21 (93%) of 23 cases, which were divided into 4 with horizontal direction-fixed nystagmus, 1 with vertical direction-fixed nystagmus, 14 with regular gaze-direction nystagmus, and 2 with irregular gaze-direction nystagmus. No particular relationship between the nystagmus finding and the stage of development of the tumor could be found, and regular gaze-direction nystagmus was most frequent in any stage. Positional nystagmus appeared in 12 (63%) of the examined 19 cases -Nylens type I 6, type II 5. type III 1-, all of which, however, had already showed spontaneous nystagmus. The result of caloric test was abnormal in 100 per cent of cases. They did not exhibit the response to irrigation with water of 30-C. for 40 seconds except in 2 cases within 6 months from their onset. This might indicate that there was the intimate relationship between the caloric hypo-excitability and the stage of developement. The abnormal results of the past-pointing, stepping, Romberg, and blindfolded vertical writing test (Fukuda) were obtained in 94%, 90%, 72%, and 71, % respectively. In addition, the blindfolded vertical test showed the different results depending on the side of the tumor, namely 58% in the cases with the left tumor and 89% in the right tumor. Furthermore, the rate to be judged as cerebellar lesion was 69% in the past-pointing test, 73% in the blindfolded vertical writing test, 89% in the stepping test. These values were nearly in accord with the rate of the gaze-direction nystagmus (74%) including the vertical spontaneous one in the nystagmus findings.
社団法人日本耳鼻咽喉科学会の論文

聴神経腫瘍の臨床的研究(その2)

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