Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Minimal retrocardiac and right basilar patchy opacities likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . No subdiaphragmatic free air .
    OUTPUT:
    
Minimal bibasilar atelectasis . No subdiaphragmatic free air .