Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . The cardiac silhouette is mildly enlarged but unchanged from the prior exam in the hilar contours are within normal limits . The pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No evidence of pneumonia . There findings were communicated to Dr . ___ by telephone at the time of discovery by Dr . ___ .