Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Cardiomediastinal silhouette and hilar contours are unremarkable . Lungs are clear . The pleural surfaces are clear without effusion or pneumothorax . There is persistent mild elevation of the left hemidiaphragm .
    OUTPUT:
    
1 . No acute cardiopulmonary abnormality . 2 . Persistent mild elevation of the left hemidiaphragm of unclear significance .