Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate massively widened upper mediastinum which is not significantly changed since the prior study from ___ , and likely related to post-surgical changes from recent ascending aortic graft repair . There has been interval removal of right internal jugular central venous catheter . Mediastinal and posterior left lateral chest wall ___ are again seen . The heart is stable in size . There is atelectasis of the left lung base , with no evidence of pulmonary edema or focal consolidation concerning for pneumonia . There is no pneumothorax .
    OUTPUT:
    
1 . Stable post - surgical appearance of the mediastinum . 2 . Minimal left basilar atelectasis .