Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . A retrocardiac opacity is stable since the prior chest radiographs ___ ___ . Interstitial lung markings likely reflects mild pulmonary vascular congestion , also stable since the prior exam . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is moderately enlarged , similar to the prior exam .
    OUTPUT:
    
No new opacity concerning for pneumonia .