Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior , there has been no significant interval change . The size of the right - sided pleural effusion has not significantly changed . Volume loss in the right hemithorax is as on prior . Component of the right basilar opacity medially is likely due to persistent right lower lobe atelectasis . Left lung is clear where not obscured by the left chest wall single - lead pacing device . There is no left - sided pleural effusion . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Persistent right - sided effusion , not significantly changed since ___ .