Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology · 2007
Fluctuating corticosteroid-responsive auditory neuropathy/dyssynchrony is suggestive of central nervous system pathology.
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Mallur Pavan S, Lalwani Anil K
Аннотация
OBJECTIVE: To highlight diagnostic and management features of auditory neuropathy/auditory dyssynchrony (AN/DS) due to central demyelinating disorder.
PATIENTS: A child with AN/DS due to central nervous system pathologic findings.
INTERVENTIONS: Audiometry, auditory brainstem response (ABR) test, otoacoustic emission test, magnetic resonance imaging (MRI) with gadolinium contrast, intravenous corticosteroid treatment, antiviral treatment, stereotactic biopsy, and cyclophosphamide immunomodulation.
MAIN OUTCOME MEASURES: Pure-tone audiometry, speech discrimination testing, ABR, and MRI.
RESULTS: A 12-year-old girl presented with acute sensorineural hearing loss, abnormal ABR, and normal otoacoustic emissions consistent with AN/DS. The hearing loss demonstrated fluctuation and corticosteroid responsiveness. Magnetic resonance imaging and stereotactic biopsy revealed brainstem demyelination consistent with multiple sclerosis. Definitive treatment consisted of cyclophosphamide immunomodulation.
CONCLUSION: Although recent focus on pathophysiology of AN/DS has shifted from auditory nerve abnormalities to dyssynchrony within the cochlea, cases associated with fluctuating sensorineural hearing loss and responsiveness to corticosteroid therapy should raise the suspicion of central nervous system pathologic findings. Therefore, it is crucial to obtain brain MRI with contrast enhancement in all patients with AN/DS. This is critical in patients undergoing cochlear implantation because MRI may be contraindicated postoperatively.
PATIENTS: A child with AN/DS due to central nervous system pathologic findings.
INTERVENTIONS: Audiometry, auditory brainstem response (ABR) test, otoacoustic emission test, magnetic resonance imaging (MRI) with gadolinium contrast, intravenous corticosteroid treatment, antiviral treatment, stereotactic biopsy, and cyclophosphamide immunomodulation.
MAIN OUTCOME MEASURES: Pure-tone audiometry, speech discrimination testing, ABR, and MRI.
RESULTS: A 12-year-old girl presented with acute sensorineural hearing loss, abnormal ABR, and normal otoacoustic emissions consistent with AN/DS. The hearing loss demonstrated fluctuation and corticosteroid responsiveness. Magnetic resonance imaging and stereotactic biopsy revealed brainstem demyelination consistent with multiple sclerosis. Definitive treatment consisted of cyclophosphamide immunomodulation.
CONCLUSION: Although recent focus on pathophysiology of AN/DS has shifted from auditory nerve abnormalities to dyssynchrony within the cochlea, cases associated with fluctuating sensorineural hearing loss and responsiveness to corticosteroid therapy should raise the suspicion of central nervous system pathologic findings. Therefore, it is crucial to obtain brain MRI with contrast enhancement in all patients with AN/DS. This is critical in patients undergoing cochlear implantation because MRI may be contraindicated postoperatively.
Предметные рубрики MeSH
AcyclovirAdrenal Cortex HormonesAntiviral AgentsAudiologyAudiometry, Pure-ToneCentral Nervous System DiseasesChildCochlear NerveCyclophosphamideEvoked Potentials, Auditory, Brain StemFemaleGadoliniumHearing Loss, UnilateralHumansImmunosuppressive AgentsMagnetic Resonance ImagingMultiple SclerosisMyelin SheathSpeech Discrimination TestsVestibulocochlear Nerve Diseases