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 . Subtle bibasilar opacities are likely atelectasis . Small left pleural effusion . No pneumothorax is seen . There are surgical clips seen in the neck .
    OUTPUT:
    
Minimal bibasilar atelectasis and possible small left pleural effusion . No evidence of pneumothorax .