This is a case of a clinically proven croup. Croup, also known as acute laryngotracheobronchitis, is an upper airway infection by parainfluenza virus or respiratory syncytial virus. On imaging, it classically presents with a narrowing of the subglottic airway and ballooning of the hypopharynx. The narrowed subglottic airway (upper trachea) may resemble a church steeple (steeple sign or wine bottle sign) due to its tapered appearance.
Differential diagnosis include:
- tracheal foreign body aspiration
- angioneurotic oedema
- enlargement of epiglottis and aryepiglottic folds
- usually older children
- congenital subglottic stenosis: different clinical presentation