Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung is clear . There is a moderate to large left pleural effusion with overlying atelectasis , underlying consolidation is not excluded . Retrocardiac atelectasis is also seen . Cardiac silhouette can not be evaluated given the left lower lobe opacity . No pneumothorax is seen .
    OUTPUT:
    
Left pleural effusion and overlying atelectasis ; underlying consolidation can not be excluded .