Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and mediastinal contours are normal . The right hilum is asymmetrically enlarged compared to the left hilum but has a similar size and configuration compared to a baseline radiograph ___ ___ . A chest CT performed in ___ demonstrated no evidence of a right hilar mass , and the observed asymmetry is probably due to a combination of a slight rotation related to mild scoliosis and a prominent pulmonary vascularity . Lungs are slightly hyperexpanded but grossly clear . There are no pleural effusions or pneumothoraces .
    OUTPUT:
    
No radiographic evidence of pneumonia .