Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates a left pectoral cardiac pacer with leads terminating in the right atrium and right ventricle . The heart is top normal in size . The mediastinal and hilar contours are within normal limits . There are increased perihilar streaky opacities , which suggests pulmonary edema . Right suprahilar pulmonary mass is redemonstrated , better correlated on cross - sectional imaging . There is dense retrocardiac probable atelectasis and small left pleural effusion .
    OUTPUT:
    
Mild pulmonary edema . Small left effusion .