Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The cardiac , mediastinal and hilar contours appear unchanged . Incompletely characterized post-surgical changes are similar along the sternum . A single fiducial marker projects over the mid posterior right chest in a similar position .
    OUTPUT:
    
No evidence of acute disease . Heart apparently at the upper limits of normal size .