Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Lung volumes are low . Patchy bibasilar airspace opacities likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No displaced fractures are evident .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .