Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to ___ , there is no significant change . Mild left basilar and right midlung atelectasis are likely . Otherwise , the lungs are grossly clear . Again seen is severely widened mediastinum and heart size due to ascending and descending aortic aneurysm and dissection , better assessed on prior CT , and unchanged from prior . Sternotomy wires and surgical clips are in place and unchanged in position .
    OUTPUT:
    
No focal opacification , though difficult to unequivocally excluded pneumonia due to large area of obscured lung .