Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest tube is unchanged in position . Following placement of the chest tube to water seal there is a tiny left apical pneumothorax measuring 6 mm in width . The lung volumes remain low with unchanged bibasilar , likely subsegmental atelectasis . Cardiomediastinal silhouette is unchanged . Bony thorax remains unchanged . Fairly large gastric air bubble .
    OUTPUT:
    
6 mm small left apical pneumothorax following placement of the chest tube to water seal . Low lung volumes with persistent , likely bibasilar atelectasis . A prominent gastric air bubble , partially visualized .