Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a left internal jugular central venous line , with the tip ending in the upper superior vena cava . No pneumothorax . Cardiomediastinal and hilar contours are unremarkable . There is mild persistent bibasilar atelectasis , which is more notable on the left . The left costophrenic angle is only partially included on this study . There is mild blunting of the right costophrenic angle , suggesting a small pleural effusion . Median sternotomy wires appear intact . Patient is status post aortic valve replacement .
    OUTPUT:
    
Interval placement of a left internal jugular central venous line , with the tip ending in the upper SVC .