Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval removal of a left - sided pigtail catheter . There is decrease in a small left pneumothorax . Small left pleural effusion is decreased in size from the prior study . There is evidence of emphysema . Cardiomediastinal and hilar contours are unchanged . The right lung is clear . Hiatal hernia is unchanged
    OUTPUT:
    
1 . Small , stable left apical pneumothorax . 2 . Decreased small left pleural effusion .