Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A small right pleural effusion is unchanged and a trace left pleural effusion has slightly increased . There is bibasilar atelectasis . Otherwise , the lungs are clear without pulmonary edema or pneumothorax . The heart size is top normal . The aortic and hilar contours are normal . A drainage catheter is in the abdomen .
    OUTPUT:
    
Unchanged small right pleural effusion and slightly increased left trace pleural effusion .