Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , bilateral small pleural effusions are improved , mild bibasilar atelectasis is unchanged , and lung volumes remain low . Heart size is stable . No pneumothorax or pulmonary edema . Subcutaneous emphysema is expected postoperatively . Note is made of a left chest tube .
    OUTPUT:
    
Small bilateral pleural effusions , left greater than right , are improved since ___ . No pneumothorax .