• Etiology: viral
  • Imaging: glottic + subglottic process
    — AP – loss of normal shoulders of subglottic trachea due to subglottic edema = church steeple sign
    — Lateral – narrowing or loss of definition of subglottic trachea, hypopharynx distension, normal epiglottis/areyepiglottic folds
  • Clinical: most common cause acute upper airway obstruction in 6 months – 3 years, inspiratory stridor, no dysphagia, change in cough sound due to vocal cord involvement – barky

Cases of Croup

Radiographs of croup
AP + lateral radiographs of the airway show narrowing of the subglottic trachea (steeple sign) and overdistension of the hypopharynx.