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Sudden deafness: histopathologic correlation in temporal bone

I Sando, A Loehr, T Harada

    The Annals of Otology, Rhinology, and Laryngology
    |May 1, 1977
    PubMed
    Summary
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    Sudden deafness histopathology reveals cochleosaccular abnormalities, suggesting viral infection as the likely cause. Findings include organ of Corti collapse and nerve damage, supporting a viral etiology for sudden hearing loss.

    Area of Science:

    • Otolaryngology
    • Neuropathology
    • Virology

    Background:

    • Sudden deafness is a complex condition with an often-unidentified etiology.
    • Histopathological examination of temporal bones offers insights into the underlying pathology of sudden hearing loss.

    Observation:

    • Two cases of sudden deafness underwent detailed histopathological analysis of temporal bones.
    • Significant cochleosaccular abnormalities were observed, including collapse of the organ of Corti and atrophy of the stria vascularis.
    • Degenerative changes in cochlear nerves and saccular structures were prominent.

    Findings:

    • Pathological changes mirrored those seen in viral labyrinthitis, strongly suggesting a viral etiology for sudden deafness.
    • Specific findings included collapse of the organ of Corti, tectorial membrane atrophy, stria vascularis atrophy, and reduced cochlear nerve count.

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  • Case 1 exhibited localized endolymphatic hydrops, a patent cochlear aqueduct, and ossification in the superior semicircular canal.

    • Implications:

    • The histopathological evidence supports viral infection as the primary cause of sudden deafness in these cases.
    • Proposed routes of viral entry include meningeal and hematogenous pathways to the inner ear.
    • Understanding these pathologies can inform future diagnostic and therapeutic strategies for sudden hearing loss.