Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mild to moderately enlarged . The mediastinal and hilar contours appear unchanged . A right - sided pleural effusion , with associated areas of persistent atelectasis , appears mostly unchanged , although there is greater fissural thickening , suggesting increasing or shifting fluid content . There is no definite pleural effusion on the left . There is no pneumothorax . A new mild central interstitial abnormality about each hilum is suggestive of mild pulmonary vascular congestion .
    OUTPUT:
    
Predominantly central interstitial abnormality , suggestive of mild vascular congestion .