Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged . There is upper zone redistribution of pulmonary vascularity and a diffuse interstitial abnormality , most suggestive of mild pulmonary vascular congestion . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Findings suggesting mild vascular congestion .