Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are provided . Lung volumes are low . The lungs are clear . No pleural effusion or pneumothorax . The heart is at the upper limits of normal in size . Mediastinal contour is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Borderline cardiac enlargement . Otherwise , normal .