Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval reduction in size of the left pleural effusion which is now moderate in extent . No pneumothorax is present . Bibasilar atelectasis is again noted , and there is mild pulmonary vascular congestion . The cardiac , mediastinal and hilar contours are unchanged .
    OUTPUT:
    
Interval decrease in size of the left pleural effusion , which is now moderate in extent . Persistent bibasilar atelectasis .