Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , mild - to - moderate bibasilar atelectasis , right greater than left , is new . The cardiomediastinal contours , hilar contours , and pleural surfaces are normal . No pneumothorax . The cardiac silhouette is mildly enlarged .
    OUTPUT:
    
1 . Mild to moderate bibasilar atelectasis , right greater than left , is new since ___ . No pneumothorax .