Pneumomediastinum as an early radiographic sign in membranous croup.
An 11-year-old girl presented with a 1-week history of cough and high fevers acutely complicated by sore throat and air hunger. Radiographs demonstrated narrowing of the subglottic airway on the frontal view (Fig. 1, black arrow) and multiple, linear tracheal irregularities evident only on the lateral view (Fig. 2, white arrows), highlighting the importance of both views. Endoscopy confirmed friable