Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged with prominence of the central pulmonary vasculature , but without frank interstitial edema . Lungs are clear with exception of left lower lobe atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild pulmonary vascular congestion without frank edema .