Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hyperinflated , but clear . Heart size and mediastinal contours are normal . Mild central vascular congestion is noted . There is no pleural effusion or pneumothorax . Osseous structures are intact .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Mild central vascular congestion .