Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided pleural effusion is now large , slightly increased . Associated atelectasis is suspected noting that superimposed infection would also be possible . The left lung is essentially clear besides trace effusion . Cardiac silhouette is difficult to accurately assess . No acute osseous abnormalities .
    OUTPUT:
    
Large right - sided pleural effusion has increased in size , with associated atelectasis noting that superimposed infection would be entirely possible . Small left pleural effusion .