Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged . Each hilum is minimally prominent which may be associated with mildly enlarged lymph nodes or slightly prominent central pulmonary vessels . There is similar mild elevation of the right hemidiaphragm . The lungs appear clear . There are no pleural effusions or pneumothorax . There is no evidence for free air .
    OUTPUT:
    
Slight prominence of each hilum , which could be seen with mild reactive lymphadenopathy or slightly distended or enlarged pulmonary vessels . No evidence for free air .