Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Minimal atelectasis is noted in the lung bases without focal consolidation . No pleural effusion or pneumothorax is present . No acute osseous abnormalities are detected . There is no subdiaphragmatic free air .
    OUTPUT:
    
Minimal bibasilar atelectasis . No subdiaphragmatic free air .