Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild elevation of the right hemidiaphragm is unchanged from the prior study and causes mild bronchovascular crowding of the right hilum . Allowing for differences in technique , appearance is similar to ___ .
    OUTPUT:
    
1 . No definite evidence of pneumonia . 2 . Unchanged mild elevation of the right hemidiaphragm .