Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is overall similar to prior examination . There is a persistent right - sided pleural effusion , apparently decreased in size comparison to most recent exam . No definite consolidation is identified . Right basilar opacity may represent atelectasis .
    OUTPUT:
    
Right - sided pleural effusion , apparently decreased in size since ___