Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are somewhat low , similar in appearance when compared to the prior study . Mild but basilar atelectasis . The cardiomediastinal contour is unchanged , the heart size is at the upper limit of normal . No consolidation , pneumothorax or pleural effusion seen .
    OUTPUT:
    
Mild bibasilar atelectasis .