Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided IJ central venous catheter is again seen , with the tip in the lower SVC , just at or above the caval - atrial junction . There has been interval removal of left - sided subclavian central venous catheter . The right hemidiaphragm remains elevated , similar to the prior examination . There is persistence of retrocardiac opacity on the left , which may again be related to low lung volumes , although the possibility of an effusion remains present . No new focal pulmonary opacities , or evidence of pleural effusion or pneumothorax .
    OUTPUT:
    
Unchanged examination , status post removal of left - sided subclavian central venous catheter .