Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged , though may be due to low lung volumes . The lungs are otherwise clear . There is no significant hilar or mediastinal lymphadenopathy , which is better assessed on prior CTA chest from ___ . The mediastinal contour is otherwise unchanged . No pleural abnormality is seen .
    OUTPUT:
    
No significant hilar or mediastinal lymphadenopathy .