中枢神経性難聴の鑑別診断に関する臨床的考察
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概要
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Various kinds of audiometric tests have been performed on 16 patients suffering from intracra- nial lesions. The findings of operation or patho- logical anatomy have clarified the locations invo- lving intracranial lesions. The special methods employed by us were a tone decay test, a direc- tional hearing test, a binaural summation test, a filtered speech test and an interrupted speech test. In all cases, the results of the pure tone and usual speech audiometries were within normal limits. However, by means of the tone decay test, abnor- mal findings were presented in 5 cases of them, by the directional hearing test in 5, by the binaural summation test in 5, by the filtered speech test in 9 and by the interrupted speech test in 12. Marked threshold tone decay was appeared in the lesions of the neural pathway from the infe- rior colliculus to the auditory cortex. The ab- normalities of the directional hearing and bina- ural summation have a tendency to appear in the lesions of the brain stem. The low discrimina- tion score in the filtered and interrupted speech tests has a tendency to appear wherever the le- sions were located in the central auditory path- way. When the lesions were located in the brain stem, the abnormalities of hearing for filtered and interrupted speech were surely recognized in the homolateral ear. When, however, the lesions were located in the regions above the brain stem, they were not always recognized in the homolate- ral ear. Consequently, we considered that the auditory pathways go up homolaterally in the bra- in stem and decussate partially in the inferior collicullus.
- 社団法人 日本耳鼻咽喉科学会の論文