Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and MVR , as before . The heart and mediastinal structures are unchanged , allowing for differences in technique . Interstitial markings remain prominent . There is increased streaky density at the lung bases and the retrocardiac area appears opaque . There is now a very small right pneumothorax . A Swan - ___ catheter chest tubes mediastinal drains endotracheal tube and nasogastric tube have been removed . The right internal jugular introducer remains in place .
    OUTPUT:
    
Development of very small right pneumothorax post chest tube removal . Persistent prominent interstitial markings likely reflecting vascular congestion . Subsegmental atelectasis . Increased density in the retrocardiac area consistent with atelectasis or consolidation as seen previously .