Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided chest tube is in satisfactory position . There is a small left apical pneumothorax . The lung volume is small , exaggerating pulmonary vascular markings . Moderate left - sided pleural effusion has decreased significantly . Mild right pleural effusion is unchanged . Bibasilar atelectasis are stable . The cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
1 . Small left apical pneumothorax . 2 . Significant decrease in left - sided pleural effusion after chest tube insertion .