Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is mildly unfolded . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Minimal patchy opacities in the lung bases likely reflect mild atelectasis . No focal consolidation , pleural effusion or pneumothorax is demonstrated . Multiple remote right - sided rib fractures are noted . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis .