derives from/develops from abdominal aorta abdominal aorta aneurysm disease specific cell type 2014-02-26T13:55:11Z AAA disease specific cell type Abdominal aortic aneurysm is a localized dilatation of the abdominal aorta exceeding the normal diameter by more than 50 percent, and is the most common form of aortic aneurysm. Approximately 90 percent of abdominal aortic aneurysms occur infrarenally, below the kidneys, but they can also occur pararenally, at the level of the kidneys, or suprarenally, above the kidneys. BTO:0005551 BrendaTissueOBO Marion