Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Heart size is similar to ___ . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Left basilar opacity may represent atelectasis or effusion . Right basilar opacity likely represents atelectasis . No focal consolidation or pneumothorax .
    OUTPUT:
    
Small left effusion and bibasilar atelectasis .