Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal image of the chest . ET tube is in adequate positions . NG tube passes into the stomach , but distal tip not included on the image . The lungs are well expanded . Bibasilar opacities are seen , likely representing atelectasis but can not exclude pneumonia or aspiration in the right clinical setting . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Bibasilar opacities , could be due to atelectasis or aspiration , vs less likely infection given clinical history .