Sign in or 

| Version | User | Scope of changes |
|---|---|---|
| Mar 10 2011, 6:48 PM EST (current) | M.J.Fuller | 1 word added |
| Mar 10 2011, 6:46 PM EST | M.J.Fuller |
The calcium sign is a finding on chest x-ray that suggests aortic dissection. It is the separation of the intimal calcification from the outer aortic soft tissue border by 10mm. (http://en.wikipedia.org/wiki/Aortic_dissection) This is not an important sign for radiographers given that it is rarely seen.
The arrowed distance represents a normal aortic wall thickness The arrowed distance represents the aneurysmal wall thickness.