Subchapter: Neck (Read entire chapter)
Diagnosis: Croup (Laryngotracheobronchitis)Frontal radiograph (left) of the upper airways demonstrates symmetric subglottic narrowing (black arrows) with loss of normal shouldering giving it a "steeple sign". There is also mild associated ballooning of the hypopharynx (asterisk). Note the normal epiglottis and aryepiglottic folds (white arrows) on the lateral view. Croup is the most common cause of upper airway obstruction in children with peak age between 6 months and 3 years). Croup is viral in etiology (usually caused by parainfluenza or RSV).
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