Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a right pleural effusion , which appears unchanged in comparison to the prior chest radiograph . There is apical pleural thickening seen on the right . The left lung appears hyperinflated , but clear . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pneumothorax is seen .
    OUTPUT:
    
Unchanged right pleural effusion .