Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume but clear . The cardiac silhouette is enlarged . The mediastinal silhouette is widened . The hilar contours and pleural surfaces are normal . No pleural effusion or pneumothorax is present . An ET tube and NG tube are appropriate .
    OUTPUT:
    
Mildly widened mediastinum is likely accentuated by low lung volumes . If an aortic injury is a clinical concern , then a CT of the chest may be obtained for further evaluation .