Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac and mediastinal silhouettes remain unchanged . There is persistence or perhaps slight increase retrocardiac opacity , which may be related to increase in retrocardiac atelectasis although there is slightly increased opacity throughout the left hemithorax , which might be related to a small layering pleural effusion . A right - sided subclavian central venous catheter is present , terminating at the lower aspect of the SVC at the right atrial junction . Sternotomy sutures are present , and appear intact . Tracheostomy tube is not visualized on this study . The patient has been extubated since the prior radiograph from 1 day ago .
    OUTPUT:
    
1 . Diffusely but mildly increased opacity of the left hemithorax , particularly in the retrocardiac region . This may be a combination of layering pleural effusion and atelectasis . 2 . Interval extubation . Right sided central venous catheter remains at the cavoatrial junction .