AP radiograph of the airway (left) shows symmetric subglottic narrowing in the first several centimeters of the trachea leading to loss of the normal shoulders of the subglottic trachea (steeple sign) due to subglottic edema. AP radiograph of the now normal airway taken a month after the resolution of symptoms (right) shows clear delineation of the normal shoulders of the subglottic trachea.
