Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains mildly enlarged . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . No focal consolidation , pleural effusion or pneumothorax is present . Minimal atelectasis is seen in the lung bases . A screw projects over the right humeral head . There are mild to moderate multilevel degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Minimal bibasilar atelectasis without focal consolidation .