Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . There is increased opacity at the right lung base compared to most recent exam but significantly improved from earlier exam . This is likely due to a combination of atelectasis and some residual pleural fluid . The left lung remains clear . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities detected . There is no pneumothorax .
    OUTPUT:
    
Mild persistent right pleural effusion with underlying likely residual atelectasis in the right lower lung .