Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been placement of a left chest tube for a previously noted pneumothorax with no pneumothorax currently seen . Bibasilar atelectasis is seen , and low lung volumes accentuate the pulmonary vasculature . Median sternotomy wires are noted . The cardiac silhouette is unchanged in size .
    OUTPUT:
    
Left chest tube placement for pneumothorax with no pneumothorax seen on current exam .