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 obtained five and a half hours earlier during the same day . During the examination interval , the left - sided lower chest tube has been removed . The left - sided pleural sinus remains free . No new infiltrates are seen . There is a small less than 1 cm wide apical pneumothorax on the left side . No major pulmonary collapse is noted and the right hemithorax is unremarkable .
    OUTPUT:
    
Small left - sided apical pneumothorax following chest tube removal . Followup with one day interval is recommended . ___ ___ paged successfully at 4 :55 p .m .