Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior study , there has been an interval increase in the right pleural effusion . No pneumothorax . Upper right lung is clear . The left lung is clear without effusion or focal consolidation . Heart size , mediastinal , and hilar contours are normal .
    OUTPUT:
    
Since ___ , there has been an interval increase in the right pleural effusion , without pneumothorax .