Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Central pulmonary vascular congestion is mild without frank interstitial edema . Cardiomediastinal silhouette and hilar contours are otherwise normal . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
Central pulmonary vascular congestion without frank interstitial edema .