Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right chest tube has been withdrawn . No pneumothorax is identified . There is minimal streaky density at the right base consistent with subsegmental atelectasis and possibly pleural fluid . Postsurgical changes including a small amount of air are again demonstrated in the mediastinum . Allowing for differences in technique , mediastinal structures are stable . The patient is status post median sternotomy and MVR , as before . An endotracheal tube , feeding tube and Swan - Ganz catheter remain in place .
    OUTPUT:
    
No evidence of pneumothorax post chest tube removal . No other significant change .