Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The cardiac , mediastinal and hilar contours appear stable including prominence of central mediastinal pulmonary arteries . There is no definite pleural effusion or pneumothorax . There is again striking upper zone redistribution of pulmonary vasculature suggesting pulmonary venous hypertension although not significantly changed . Otherwise , aside from slight suspected atelectasis at the left lung base , the lungs appear clear .
    OUTPUT:
    
Findings suggest pulmonary venous hypertension . Enlarged central pulmonary arteries .