Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The right heart border is not well seen ; however , this is unchanged from prior exam and is likely due to mediastinal fat . The hilar contours are unremarkable . The lungs are clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .