Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are reviewed and compared to the most recent prior study . Opacity in the right upper lung has decreased and likely represents postoperative bleeding or atelectasis which is expected . The right - sided chest tube has been removed and a small 1 - cm right apical pneumothorax is unchanged . The lung volumes have improved and bibasilar atelectasis has decreased . The heart size and hilar contours are normal and there are aortic calcifications .
    OUTPUT:
    
1 . Unchanged small right apical pneumothorax status post removal or right chest tube . 2 . Improved lung volumes and decreased bibasilar atelectasis . 3 . Improved right upper lung opacity , likely represents expected postoperative bleeding and atelectasis .