Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph obtained with comparison to the examination performed approximately 10 hours previously demonstrates persistent left retrocardiac opacity at the base , probably with associated effusion , although difficult to assess on this single view . The left upper lung zones as well as the right lung zones appear relatively clear . Rounded opacities seen at the right hilum are better demonstrated on the subsequent CT , which was performed after the study . Right - sided IJ central venous catheter is present , terminating at the cavoatrial junction .
    OUTPUT:
    
Left retrocardiac opacities consistent with atelectasis and probable effusion . Right hilar opacity consistent with lymph node .