Season 1 Case 41
Case 41 History: MVA
This one is a little tough. I’ll give you the subQ air and it’s not a rib fx. Name the sign and the dx.

Answer:
CLICK HERE FOR ANSWER
This was a bit of a eye test. The subcutaneous air was actually a hint. Check out the diaphragms, are they continuous?
Answer: Continuous diaphragm sign - ie Pneumomediastinum
short write ups:
http://radiopaedia.org/articles/continuous-diaphragm-sign
http://residents.thoracicrad.org/BasicSign/CDS.html
nice archival paper on pneumomediastinum signs: http://www.ajronline.org/doi/pdf/10.2214/ajr.166.5.8615238