Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is new mild - to - moderate relative elevation of the right hemidiaphragm compared to the left . There is no evidence for free air . The lung volumes are low . Allowing for differences in technique , the mediastinal , hilar , and cardiac contours appear unchanged . The lungs appear clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Elevation of the right hemidiaphragm , new since the prior examination . No evidence for free air .