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Related Experiment Videos

Bulbar changes with laryngeal paralysis

G E Arnold, C B Stephens

    Archives of Otolaryngology (Chicago, Ill. : 1960)
    |February 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A lung cancer lesion can cause vocal cord paralysis. This study found evidence supporting ascending metastasis over nerve degeneration, explaining the paralysis mechanism.

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    Area of Science:

    • Neurology
    • Oncology
    • Laryngology

    Background:

    • Vocal cord paralysis can result from chest lesions affecting laryngeal nerves.
    • Two hypotheses exist: retrograde vagus nerve degeneration or ascending metastasis.

    Observation:

    • A case of inoperable lung cancer with bilateral laryngeal nerve paralysis was studied.
    • The brain-stem was sectioned, and nucleus ambiguus cells were quantified.
    • Central chromatolysis was analyzed in relation to laryngeal paralysis.

    Findings:

    • Equal numbers of nucleus ambiguus cells on both sides ruled out irreversible retrograde degeneration.
    • Central chromatolysis was significantly more frequent on the side of laryngeal paralysis.
    • Intermediate vocal cord position correlated with paralysis of both laryngeal nerves on the affected side.

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    Implications:

    • Findings support ascending metastasis as the mechanism for vocal cord paralysis from chest lesions.
    • This clarifies the pathophysiology of laryngeal nerve involvement in lung cancer.
    • Understanding this pathway aids in diagnosing and managing neurological complications of thoracic malignancies.