Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided central venous catheter terminates in the mid to upper SVC and is unchanged . The cardiomediastinal and hilar contours are within normal limits and stable . The patient is status post median sternotomy . Upper lobe opacities , right greater than left are similar in appearance . Known pleural thickening at the left base is unchanged . There may be a small right pleural effusion .
    OUTPUT:
    
Persistent upper lobe opacities , right greater than left not significantly changed .