Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube is again seen . There has been interval placement of a right - sided subclavian central venous catheter , with the tip in the region of the cavoatrial junction . There is a dual chamber cardiac pacemaker present , with leads as expected in position . Allowing for the lung volumes , the cardiac and mediastinal silhouettes are probably within normal limits . The left hemithorax appears unchanged since the prior examination , with disproportionate of volume loss of the left hemithorax compared with right , as well as retrocardiac opacity . No osseous abnormalities are appreciated on this limited radiograph .
    OUTPUT:
    
1 . Right central venous catheter tip is in the region of the cavoatrial junction . 2 . Persistent volume loss of the left hemithorax and retrocardiac opacity .