Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left pigtail chest tube is in place . Interval resolution of left apical pneumothorax . SMALL LEFT PLEURAL EFFUSION UNCHANGED . THE LUNGS ARE CLEAR . The cardiomediastinal and hilar contours are normal . The remaining pleural surfaces are normal .
    OUTPUT:
    
Interval resolution of left apical pneumothorax . PERSISTENT SMALL left pleural effusion DESPITE INDWELLING LEFT PIGTAIL PLEURAL DRAINAGE CATHETER . No hydropneumothorax .