Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is marked prominence of the mediastinal contour in this patient with known aortic dissection aneurysm . Overall appearance appears similar to the prior chest radiograph . Lungs are clear without signs of pneumonia or edema . No large effusion or pneumothorax is seen . No acute osseous abnormality is seen .
    OUTPUT:
    
Stable prominence of the mediastinum in this patient with known aortic dissection and aneurysm .