part of part of has part has part characteristic of inheres in has modifier Abdominal aortic aneurysm Asymmetric abdominal aortic aneurysm 2017-12-22T11:19:37Z Abdominal aortic aneurysms (AAAs) in an advanced stage of development are truly asymmetric, due to the presence of tissue surrounding the abdominal aorta and to the vertebral column located posterior to this artery segment. This makes a large AAA less fusiform and to grow apart from the centerline of the lumen, accounting for a major anterior dilation and a more flat posterior surface. An abdominal aortic aneurysm that is not symmetric around its axis (not axisymmetric). aneurysm abnormal increased amount asymmetrical abdominal aorta