Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes which likely in part accentuate the cardiomediastinal silhouette . There is mild prominence of the superior mediastinum , most likely related to low lung volumes , and AP , portable view . However , if there is clinical concern for acute mediastinal injury , chest CT is more sensitive . The lungs are grossly clear . No focal consolidation is seen . There is no pleural effusion or pneumothorax . No displaced fracture is identified .
    OUTPUT:
    
Low lung volumes . Mild prominence of the superior mediastinum most likely related to low lung volumes , and AP , portable view . However , there is high clinical concern for acute mediastinal injury , chest CT is more sensitive . No focal consolidation . No pneumothorax seen .