Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Comparison is made with the next preceding similar study of ___ . Right - sided chest tube advanced from right lower lateral chest wall remains in unchanged position . The previously seen small right - sided apical pneumothorax has now disappeared . No new pulmonary abnormalities are seen . Heart size unchanged , no mediastinal shift .
    OUTPUT:
    
Resolution of previously identified small apical pneumothorax , status post pleural biopsy .