Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting semi-upright position . Comparison is made with the next preceding similar study of ___ . On the preceding study of ___ , a very small pneumothorax remained after pigtail catheter removal measured less than 0 .5 cm in width . On this present followup examination of ___ , this tiny pneumothorax can not be identified anymore . No new pulmonary abnormalities are seen .
    OUTPUT:
    
No remaining pneumothorax .