Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right thoracostomy tube is unchanged in position . There is no pneumothorax . The patient is post CABG . The lung volumes are low . A small left pleural effusion and adjacent atelectasis are stable since the ___ study . There has been interval removal of a right IJ sheath .
    OUTPUT:
    
Low lung volumes . Unchanged small left pleural effusion and left basilar atelectasis . No pneumothorax .