Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in upright position . Comparison is made with the next preceding similar study obtained seven hours earlier during the same day . The on next previous examination visible pleural wall line detected some 5 cm below the osseous border of the left hemithorax apical wall can not be identified anymore . It is concluded that the pneumothorax has been eliminated . The previously described pigtail and pleural drainage tube remains in unchanged position . No other pulmonary or pleural abnormalities are identified . No new parenchymal infiltrates .
    OUTPUT:
    
Pneumothorax can not be identified anymore . Drainage line remains in place . Further followup is recommended .