Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior chest x-ray there is been interval enlargement of the right - sided pleural effusion with likely associated atelectasis . Known bilateral pulmonary nodules are not identified on this x-ray . The left lung is clear . Cardiomediastinal silhouette is difficult to assess given silhouetting on the right . Postthoracotomy changes are noted in the right .
    OUTPUT:
    
Moderate right pleural effusion similar to recent PET - CT , increased since ___ .