Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes , with bibasilar atelectasis . The post-operative mediastinum appears widened with loss of normal mediastinal landmarks . A chest tube is in place . There is no pneumothorax . Right - sided thoracotomy changes are present .
    OUTPUT:
    
Wide post-operative mediastinum , which may reflect postoperative changes , but mediastinal hematoma could produce a similar appearance . Short - term followup radiographs and clinical correlation are advised . No pneumothorax . These findings were discussed with Dr . ___ at 4 :45 p .m . , and it was confirmed that an endotracheal tube was not present .