Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is moderately enlarged . The aorta is mildly tortuous . Superior mediastinum is prominent in this patient with known aortic dissection Compared to the outside exam , the vascular engorgement is worse . There is volume loss at the bases . An underlying infectious infiltrate can not be excluded .
    OUTPUT:
    
Recent appearance to the mediastinum compared outside study . Patient has known aortic dissection .