Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube and nasogastric tube remain in good position . New left retrocardiac and basal opacity of the left hemidiaphragm representing atelectasis and likely small effusion . The right lung remains clear . The cardiac silhouette is not enlarged . No pneumothoraces .
    OUTPUT:
    
Worsening opacity left base likely atelectasis with associated effusion .