Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Following removal of right - sided chest tube , there is no evidence of pneumothorax . Cardiomediastinal contours are stable in the postoperative period . Improving atelectasis at both lung bases , and persistent small bilateral pleural effusions . Status post median sternotomy and aortic valve replacement procedure .
    OUTPUT:
    
1 . No evidence of pneumothorax following chest tube removal . 2 . Improving bibasilar atelectasis . Small pleural effusions .