Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior chest radiograph , previous right basilar opacity has improved . Moderate cardiomegaly and substantial enlargement of the aortic arch ( related to known dissection ) is stable since at least ___ . No new focal consolidation , pleural effusions , or pneumothorax . Median sternotomy wires are intact .
    OUTPUT:
    
1 . No focal consolidation concerning for pneumonia . 2 . Re - demonstration of known moderate cardiomegaly and substantial enlargement of the aortic arch . Findings are unchanged since at least ___ .