Thoracic Aortic Dissection (DeBakey Type II)

thoracic aortic dissection

In aortic dissection, blood enters the medial layer of the aortic wall through a tear or ulcer in the intima and tracks along the media, forming a second blood-filled channel within the wall. The normal lumen lined by intima is call the true lumen and the blood-filled channel in the media is called the false lumen. The false lumen is at higher pressure than the true lumen due to poor outflow.

Along with the Stanford classification, the DeBakey classification is used to separate aortic dissections into those that need surgical repair, and those that usually require only medical management. The Debakey classification divides dissections into:

* Type I: involves ascending and descending aorta = Stanford A
* Type II: involves ascending aorta only = Stanford A
* Type III: involves descending aorta only = Stanford B

Read more about aortic dissections here.
For illustrations of type I and III visit Radiopaedia.org here.

CTA chest inset image courtesy of Dr D. D’Souza

Credit: Dr Frank Gaillard