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external nasal valve


Definition: a valvelike fold formed by the lateral crus of the alar (i.e., lower lateral) cartilage and its associated external and vestibular soft tissue coverings; a common cause of nasal airway obstruction when the valve is incompetent and the alar rim collapses during inspiration.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.