In 1986, Crawford described the first TAAA classification scheme based on the anatomic extent of the aneurysm. Type I involves most of the descending thoracic aorta from the origin of the left subclavian to the suprarenal abdominal aorta. Type II is the most extensive, extending from the subclavian to the aortoiliac bifurcation. Type III involves the distal thoracic aorta to the aortoiliac bifurcation. Type IV TAAAs are limited to the abdominal aorta below the diaphragm. Safi’s group modified this scheme by adding Type V, which extends from the distal thoracic aorta including the celiac and superior mesenteric origins but not the renal arteries.There are two major types of aneurysm morphology: fusiform, which is uniform in shape with symmetrical dilatation that involves the entire circumference of the aortic wall, and saccular, which is more localized and appears as an outpouching of only a portion of the aortic wall. Saccular aneurysms may be a manifestation of plaque hemorrhage and aortic ulceration or aortic wall infection and appear to have an increased risk for rupture.
Thoracic aortic aneurysm classification
Aortic stenosis classification
Abdominal aortic aneurysm classification
Thoracic aortic aneurysm physical examination
Aortic dissection classification
Pulmonary embolism classification
Left ventricular aneurysm classification
Aortic insufficiency classification of severity