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Extra- and intra-axial brain stem auditory disorders.

S Jerger, J Jerger

    Audiology : Official Organ of the International Society of Audiology
    |March 1, 1975
    PubMed
    Summary
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    Auditory symptoms in brain stem disorders differ based on lesion type. Extra-axial lesions cause sensitivity loss and ipsilateral symptoms, while intra-axial lesions result in minimal loss and bilateral or contralateral symptoms.

    Area of Science:

    • Neurology
    • Audiology
    • Neurotology

    Background:

    • Brain stem disorders can manifest with diverse auditory symptoms.
    • The location of brain stem lesions (extra-axial vs. intra-axial) influences auditory pathway involvement.

    Purpose of the Study:

    • To compare auditory test results between patients with extra-axial, intra-axial, and combined brain stem lesions.
    • To identify distinct auditory patterns associated with different lesion types in the brain stem.

    Main Methods:

    • Auditory tests were administered to 45 patients with brain stem disorders.
    • Patients were categorized into three groups: extra-axial (n=28), intra-axial (n=11), and combined (n=6).
    • Audiometric findings including sensitivity, Békésy audiometry, and PBmax scores were analyzed.

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    Main Results:

    • Extra-axial lesions were associated with sensitivity loss, marked Békésy audiometry adaptation, impaired PBmax scores, and ipsilateral auditory symptoms.
    • Intra-axial lesions typically presented with slight sensitivity loss, normal Békésy audiograms, good PBmax scores, and bilateral or contralateral auditory symptoms.
    • Auditory findings in combined lesions varied based on the degree of extra-axial involvement.

    Conclusions:

    • Auditory test results can help differentiate between extra-axial and intra-axial brain stem lesions.
    • Specific audiometric patterns correlate with lesion location, aiding in diagnosis and localization of brain stem disorders.