Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Retrocardiac opacity obscures the medial left hemidiaphragm . There is no pneumothorax . There may be trace bilateral pleural effusions . There is moderate bilateral pulmonary vascular congestion and mild to moderate interstitial edema . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . Retrocardiac opacity could be due to atelectasis or pneumonia . 2 . Mild to moderate interstitial edema .