Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a persistent opacity at the right base , which appears slightly more confluent than on the prior exam . The right effusion has improved , though a small one persists . There is a small retrocardiac opacity with associated volume loss and a small left pleural effusion . This likely represents atelectasis , though an associated pneumonia is difficult to exclude . There is no pulmonary edema or pneumothorax . The cardiomediastinal silhouette is normal . The tracheostomy tube is in satisfactory position .
    OUTPUT:
    
1 . Slightly more confluent right basilar opacity , consistent with persistent , possibly worsening , pneumonia . 2 . Retrocardiac opacity is likely atelectasis , though a component of continued pneumonia is difficult to exclude . 3 . Small left pleural effusion .