Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unremarkable . No pulmonary edema is identified . Streaky opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis .