Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . This slightly limits assessment of lung bases where there are streaky opacities likely reflecting atelectasis . The heart size is top normal . The mediastinal and hilar contours are unchanged , with mild tortuosity of the thoracic aorta again noted . Pulmonary vascularity is not engorged . No pleural effusion or pneumothorax is identified .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .