Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , exaggerating the cardiac silhouettes and pulmonary vasculature with associated bibasilar atelectasis . The cardiac silhouette is mildly enlarged with postoperative mediastinum and mild tortuosity of the thoracic aorta . There is central pulmonary vascular congestion with cephalization but without frank interstitial edema and is improved compared to earlier exam . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax . A right dual - lead pacer is in standard position .
    OUTPUT:
    
Central pulmonary vascular congestion without frank interstitial edema improved compared to earlier same day exam .