What is the most common type of true aneurysm?

Fusiform aneurysms are the most common type of true aneurysm. These aneurysms are characterized by a uniform and symmetrical dilation of the vessel wall, resulting in a spindle-shaped or elongated appearance. Fusiform aneurysms generally involve the entire circumference of the affected segment of the artery, making them distinct from other types of aneurysms.

This type of aneurysm is often found in larger arteries, such as the abdominal aorta, where hemodynamic stress can lead to changes in the vessel wall. The prevalence of fusiform aneurysms is attributed to their stability and the manner in which they develop over time. Their shape allows for a more gradual weakening of the arterial wall, which often makes them less prone to rupture compared to other forms.

In terms of clinical significance, the recognition of fusiform aneurysms in imaging studies is crucial, as they can present challenges in surgical intervention or endovascular repair due to their nature and the extent of involvement with surrounding structures. Understanding the characteristics and commonality of fusiform aneurysms is essential for anyone studying abdominal vascular anatomy and pathology.