Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . There is new mild - to - moderate relative elevation of the right hemidiaphragm compared to the left side . The lungs appear clear . Slight degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . New mild relative elevation of the right hemidiaphragm since ___ .