A focal dilatation of the anterior wall of the abdominal aorta is referred to as what type of aneurysm?

A focal dilatation of the anterior wall of the abdominal aorta is referred to as a saccular aneurysm because this type of aneurysm is characterized by a localized outpouching or ballooning of the arterial wall. Saccular aneurysms typically involve a section of the vessel wall, leading to a distinct sac-like enlargement that can appear on one side of the lumen. This localized expansion contrasts with other types of aneurysms.

In the case of a saccular aneurysm, the segment of the aorta expands due to a weakness in the vessel wall, allowing blood to accumulate within the pouch. These aneurysms can result from various factors, including hypertension, atherosclerosis, or trauma, and are important to identify because they have a higher risk of rupture compared to other aneurysm types.

Fusiform aneurysms, for instance, involve a symmetrical, spindle-shaped dilation of the entire circumference of the aorta rather than a focal area. Berry aneurysms are small, berry-shaped outpouchings typically found in the cerebral arteries, and dissecting aneurysms occur when there is a tear in the vessel wall allowing blood to flow between the layers of the arterial wall. Each of these has distinct