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Laryngotracheobronchitis.
Anteroposterior (A) and lateral (B) neck radiographs of a 2-year-old child with croupy cough, inspiratory stridor, and fever.
The anteroposterior view shows subglottic narrowing, referred to as the “steeple” sign (arrow), characteristic of laryngotracheobronchitis. Lateral view shows ballooning of hypopharynx resulting from laryngeal obstruction.
(Courtesy Joan McIlhenny, MD, Department of Radiology, University of Virginia Medical Center.)
