Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest provided . Since prior study from earlier today , there has been interval improvement in left pneumothorax . There is residual small left apical pneumothorax . Left - sided chest tube is in unchanged position . Right lung is clear . Cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
Left pneumothorax has decreased in size since prior study from earlier today .