Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear unchanged . A bulging contour to the left lower mediastinum suggests lipomatosis of the lower mediastinum as seen on the remote prior CT . The lungs appear clear . There are no pleural effusions or pneumothorax . Slight degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease .