The Thoracic aortic dissection page has been updated with revised information about the utility of D dimer in the diagnosis.
Asha, SE, Miers, JW. A Systematic Review and Meta-analysis of D-dimer as a Rule-out Test for Suspected Acute Aortic Dissection. Annals of Emergency Medicine;66(4):368-78. http://dx.doi.org/10.1016/j.annemergmed.2015.02.013.