Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest was obtained with patient in upright position . Comparison is made with the next preceding similar study of ___ . The right - sided pigtail end catheter remains in unchanged apical position in the right hemithorax overlying the anterior portion of the second rib on the frontal view . This is unchanged in comparison with the preceding study . The apical pneumothorax widening is minimal and less than 1 cm . A small loculated right basal pneumothorax is still present and a small amount of pleural fluid blunts the right lateral pleural sinus . No other new pulmonary abnormalities are seen . Heart size is within normal limits and no pulmonary congestion exists .
    OUTPUT:
    
Further regression of pneumothorax , unchanged position of drainage tube .