Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Bilateral hila appear mildly enlarged , possibly due to enlargement of the vasculature but lymphadenopathy can not be ruled out . There is tortuosity of the descending aorta . The heart size is normal . No pneumothorax , pulmonary edema , or pleural effusion . No focal consolidations are noted .
    OUTPUT:
    
Enlargement of the bilateral hila may be due to enlargement of the vasculature . However , lymphadenopathy can not be excluded .