Aortic Aneurysm, Familial Abdominal, 4, also known as aortic aneurysm, familial abdominal 4, is related to aortic aneurysm, familial abdominal, 1 and aortic aneurysm, familial abdominal, 3. An important gene associated with Aortic Aneurysm, Familial Abdominal, 4 is AAA4 (Aortic Aneurysm, Familial Abdominal, 4).