• Etiology: parainfluenza virus
  • Imaging: glottic + subglottic process
    — AP radiograph – loss of normal shoulders of subglottic trachea due to subglottic edema = (church) steeple sign
    — Lateral radiograph – hypopharynx distension, normal epiglottis/areyepiglottic folds, narrowing or loss of definition of subglottic trachea
  • Clinical: average age 12 months, most common cause acute upper airway obstruction in 6 months – 3 years, symptoms are barky cough due to vocal cord involvement / mild fever / shortness of breath, inspiratory stridor, no dysphagia

Radiology 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.
Radiograph of croup
AP radiograph of the airway (left) shows loss of the normal shoulders of the subglottic trachea (steeple sign). Lateral radiograph of the airway (right) shows distension of the hypopharynx, a normal epiglottis and some narrowing of the subglottic trachea.

Endoscopy Cases of Croup

Endoscopic image of croup
Series of endoscopic images of the airway show persistent narrowing of the subglottic trachea.