Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes without focal consolidation , effusion , or pneumothorax . The cardiac silhouette is moderately enlarged , there is stable widening of the mediastinum . Pulmonary vasculature appears normal .
    OUTPUT:
    
Low lung volumes , without pneumonia or CHF . Moderate cardiac enlargement is stable in appearance .