Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size and mediastinal contours are normal . Bilateral hilar prominence is present and appears symmetrical . The lungs and pleural surfaces are clear . No acute skeletal findings .
    OUTPUT:
    
Bilateral hilar prominence , which could reflect prominent pulmonary vasculature or symmetrical hilar lymph node enlargement such as may be encountered in sarcoidosis . Comparison to older chest radiographs would be helpful to determine long - term stability . In the absence of older chest x-rays , contrast - enhanced CT could be considered to further assess the hilar structures if warranted clinically .