Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiographs are obtained with the patient in upright position during both inspiration and expiration . Right chest tube is stable . Cardiomediastinal contours are unchanged . Lung volumes are significantly decreased but unchanged compared to the prior study . Persistent bilateral areas of atelectasis . No pneumothorax . Inspiratory and expiratory films show no significant difference in the intensity of the subcutaneous air which would be suggestive of a leak .
    OUTPUT:
    
No significant changes compared to the prior study .