Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The lungs appear clear . No pleural effusion or pneumothorax is seen . The cardiac silhouette is top - normal , likely accentuated by low lung volumes . No pulmonary edema is seen .
    OUTPUT:
    
Low lung volumes . Clear lungs . Top - normal cardiac silhouette size , however , likely accentuated by relatively low lung volumes .