Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study there is increased opacification of the left lung base , this likely reflects a combination of pleural fluid and atelectasis , superimposed infection can not be excluded . Support lines and tubes equipment are unchanged in appearance . Mild pulmonary vascular congestion and pulmonary edema have improved slightly when compared to the prior study . No pneumothorax seen .
    OUTPUT:
    
Increased opacification of the left lung base likely reflects a combination of pleural fluid and atelectasis , superimposed infection can not be excluded .