Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single supine portable view of the chest . Low lung volumes are noted with secondary crowding of the bronchovascular markings . Within this limitation and due to limitation of overlying trauma board , the lungs are grossly clear . The cardiomediastinal silhouette is within normal limits allowing for this limitation . No displaced fracture is identified .
    OUTPUT:
    
Unremarkable supine portable plain film .