Findings

1-Pneumothorax: air within the pleural space

2-Typically located in a non-dependent location

3-Primary Sign: white visceral pleural line with black air on either side

4-Supportive Sign: absence of lung markings peripheral to this line

http://eradiology.bidmc.harvard.edu/Classics/item.aspx?section=Emergency+Radiology&labelpk=33f0adab-853f-4010-a0e2-0756b3f1eac5&pk=47e770fc-cbbd-45d7-819e-440d89f53123