Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding similar study of ___ . The previously remaining small right - sided apical postoperative pneumothorax can not be identified anymore . Scar formation occupies now the right superior mediastinum , but no new pulmonary abnormality is seen . Prominence of right hilum is unchanged . Mild elevation of right - sided diaphragm as before . No new pulmonary abnormalities are seen . The left - sided hemithorax is unremarkable . Both posterior pleural sinuses are clear on the lateral view which eliminates any residual free pleural effusion .
    OUTPUT:
    
Regression of postoperative residuals . No new abnormalities . No remaining pneumothorax .