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d) unilateral recurrent laryngeal N paralysis
Subglottic stenosis is a congenital or acquired narrowing of the subglottic airway. Although it is relatively rare, it is the third most common congenital airway problem (after laryngomalacia and vocal cord paralysis). The causes of acquired subglottic stenosis include endotracheal intubation, external trauma, infection or inflammation or thermal or caustic injuries. By far, the most common cause of acquired subglottic stenosis is endotracheal intubation resulting in 90% of the cases.
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