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Related Experiment Videos

Pathogenesis of protruded false vocal fold.

I Honjo, S Tanaka, M Tanabe

    Archives of Otolaryngology (Chicago, Ill. : 1960)
    |June 1, 1985
    PubMed
    Summary

    Thyroid cartilage deformities, including a concave thyroid ala and a smaller angle between the thyroid alae, contribute to false vocal fold protrusion in aged men. These changes are likely acquired due to aging.

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    Area of Science:

    • Otolaryngology
    • Anatomy
    • Radiology

    Background:

    • False vocal fold protrusion is a rare condition affecting phonation.
    • The anatomical basis for this protrusion has not been fully elucidated.

    Purpose of the Study:

    • To investigate the underlying anatomical structures responsible for false vocal fold protrusion.
    • To determine if thyroid cartilage morphology is associated with this condition.

    Main Methods:

    • Computed tomography (CT) scans were performed on ten patients with false vocal fold protrusion.
    • CT findings were analyzed for thyroid cartilage morphology, specifically the thyroid ala and the angle between the alae.
    • Measurements were compared to those of normal controls.

    Main Results:

    • Patients consistently showed a concave thyroid ala on the side of protrusion.
    • A significantly smaller angle between the thyroid alae was observed in patients compared to controls.
    • These two deformities were present together in all affected patients.

    Conclusions:

    • A combination of a concave thyroid ala and a reduced angle between the thyroid alae likely causes false vocal fold protrusion.
    • The observed thyroid cartilage deformities are presumed to be acquired in aged men, possibly related to the aging process.

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