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[edit] Discussion

  • AKA acute laryngotracheobronchitis
  • Usually caused by a parainfluenza virus or respiratory syncytial virus.
  • Most common cause of upper respiratory distress in infants and young children, with the highest incidence between the ages of 6 months and 3 years.
  • Child classically presents with inspiratory stridor and a barking cough.
  • Croup is usually self-limited, with a good prognosis.
  • Treatment is directed toward improving air exchange. Conservative measures, nebulized racemic epinephrine, and corticosteroids are commonly used.

[edit] Imaging Findings

[edit] Plain film

  • Steeple sign is seen on anteroposterior radiographs of the soft tissues of the neck.
    • Normal lateral convexities of the subglottic trachea are lost, and narrowing of the subglottic lumen produces an inverted V configuration in this area.
    • Point of the inverted V is at the level of the inferior margin of the true vocal cords.
    • Narrowing of the subglottic lumen alters the radiographic appearance of the tracheal air column, which resembles a steeply pitched roof or a church steeple.
  • The lateral radiograph of the upper airway will show a normal epiglottis and narrowing of the subglottic region.

[edit] Images

Patient #1

[edit] See Also

[edit] External Links

[edit] References