Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The tip of the right internal jugular central venous catheter extends to the right atrium . Low bilateral lung volumes . New retrocardiac opacity likely reflects a combination of atelectasis and pleural fluid . There is mild pulmonary interstitial edema . No pneumothorax identified . The size of the cardiac silhouette is enlarged .
    OUTPUT:
    
Mild pulmonary interstitial edema . New retrocardiac opacity may reflect a combination of atelectasis and pleural fluid .