Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lung volumes are low . Mild bibasilar opacities most likely represent atelectasis with a small left pleural effusions . No evidence of pulmonary edema . No pneumothorax is seen .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis and small left pleural effusion . No evidence of pulmonary edema .