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Bulbar changes with laryngeal paralysis
Archives of Otolaryngology (Chicago, Ill. : 1960)
|February 1, 1980
Summary
A lung cancer lesion can cause vocal cord paralysis. This study found evidence supporting ascending metastasis over nerve degeneration, explaining the paralysis mechanism.
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.
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.