Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left chest wall pacemaker is present with leads in the right ventricle and coronary sinus . There is no focal consolidation or pneumothorax . There is a small - to - moderate layering right pleural effusion . Mild upper zone redistribution is noted but there is no overt pulmonary edema . The heart is enlarged , as seen previously .
    OUTPUT:
    
Small - to - moderate right pleural effusion .