Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left pleural effusion with overlying atelectasis , similar in amount as compared to the prior study . A small right pleural effusion appears decreased but persistent . Right basilar opacity may be due to overlying atelectasis although a consolidation is not excluded in the appropriate clinical setting . Cardiac and mediastinal silhouettes are stable . No pneumothorax is seen . There appears to be mild vascular congestion as well .
    OUTPUT:
    
Persistent large left pleural effusion . Left mid lung zone consolidative opacity has decreased in the interval . Small right pleural effusion appears decreased . Increased right basilar opacity may be due to overlying atelectasis although consolidation is not excluded . Mild vascular congestion .