Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal expiratory chest radiograph again demonstrates a left apically directed chest tube in place . The small left apical pneumothorax is decreased in size , but persistent . Left rib fractures are unchanged . Lung volumes are lower , with increasing bibasilar opacities likely reflecting increased atelectasis . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
1 . Persistent small left apical pneumothorax , decrease in size . 2 . Increasing bibasilar opacities likely reflect atelectasis , given lower lung volumes and expiratory technique .