Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right apical pleural pigtail catheter is unchanged in position . There is tiny right apical pneumothorax visualized on the current study . The lung volumes are slightly improved from one hour earlier with minimally improved aeration . No large pleural effusion is seen . The cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Tiny right apical pneumothorax . Improved lung volumes and aeration from one hour earlier .