Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Streaky opacities in the lung bases likely reflect atelectasis though infection is not completely excluded . No large pleural effusion or pneumothorax . No acute osseous abnormalities demonstrated . No subdiaphragmatic free air is seen .
    OUTPUT:
    
Streaky bibasilar opacities may reflect atelectasis . Infection is not completely excluded . No subdiaphragmatic free air .