Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal view of the chest was obtained . The heart is of top normal size , exaggerated by low lung volumes . Mediastinal contours are unremarkable . No focal consolidation , substantial pleural effusion , or pneumothorax . No radiopaque foreign body .
    OUTPUT:
    
Top normal heart size , exaggerated by low lung volumes .