Examine for the presence of any masses, deviation of tracheobronchial structures, and complicating lung collapse.
Inspiratory and expiratory posterior-anterior films or fluoroscopy may demonstrate air trapping in the presence of endobronchial obstruction. In patients unable to perform these maneuvers, lateral radiographs with first the left side and then the right side up may demonstrate failure of the lung containing the foreign body to decompress when that lung is placed in the dependent (down) position.
Extrapulmonary gas shadows are indicative of airway disruption until proven otherwise.
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