Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph . Streaky opacities in the lung bases may reflect atelectasis , but infection is not excluded . No overt pulmonary edema is present . There is no large pleural effusion or pneumothorax . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Bibasilar airspace opacities could reflect atelectasis , but infection is not excluded .