Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral pulmonary hilar contours are prominent and are unchanged since ___ . No consolidation , pneumothorax , or pleural effusion . Top normal heart size . Mediastinal and hilar contours have been stable .
    OUTPUT:
    
Prominent pulmonary hilar contours , stable since ___ . Otherwise normal chest radiograph without evidence of pneumonia .