Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided chest tube is visualized . There is a 16 mm left apical pneumothorax . There is bibasilar atelectasis . No evidence of a pulmonary nodule on the current study . Cardiomediastinal silhouette is enlarged .
    OUTPUT:
    
16 mm left apical pneumothorax .