Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . Tracheostomy tube is again noted . Appearance of the bibasilar opacities has not significantly changed . There is no large effusion . Cardiomediastinal silhouette is unchanged as are the osseous and soft tissue structures .
    OUTPUT:
    
Persistent bibasilar opacities potentially due to atelectasis noting that aspiration or infection are also possible .