Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilaterally , there are 2 apical curvilinear lines which could relate to rib margins , but raise the possibility of pneumothorax , however these are not seen on CT dated ___ . The cardiomediastinal silhouette is largely unremarkable on this portable film . Mild atelectatic changes are seen at the bases . There is prominent small and large bowel gas seen .
    OUTPUT:
    
Bilateral apical curvilinear lines which could be related to ribs , but raise the possibly of pneumothorax . However , no pneumothorax is seen on CT dated ___ .