After placing a stethoscope over a small child's trachea, the therapist hears expiratory stridor. Which of the following conditions is consistent with this finding?

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Stridor is a high-pitched, monophonic, audible noise that may occur during inspiration or expiration, or may be biphasic. Inspiratory stridor suggests extrathoracic airway obstruction, such as occurs in laryngomalacia, subglottic stenosis, and croup. Expiratory stridor suggests intrathoracic central airway obstruction, such as occurs in mass or vascular compression of the trachea, tracheomalacia, and bronchomalacia. Biphasic stridor typically indicates a more severe degree of laryngeal or central airway obstruction and may be associated with signs of respiratory distress.

After Placing a Stethoscope Over a Small Child's Trachea, the Therapist