Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Moderate size right pleural effusion appears minimally decreased in size compared to the prior study . Small left pleural effusion appears almost completely resolved . Bibasilar airspace opacities likely reflect atelectasis . Pulmonary vasculature is not engorged . No pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Moderate size right and small left pleural effusions , both of which have decreased since the previous study . Bibasilar atelectasis .