Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged , including an enlarged convex right lateral mediastinal contour suggesting dilatation of the ascending aorta although probably unchanged . Costophrenic sulci are not completely excluded , but there is no evidence for pleural effusion or pneumothorax , and the lungs appear clear .
    OUTPUT:
    
Stable appearance of the chest . Suspected dilatation and possibly substantial aneurysm of the ascending aorta . If not already performed , evaluation with a chest CT could be considered when clinically appropriate .