Which of the following aneurysms is an example of a sacculated aneurysm?

A sacculated aneurysm is characterized by an outpouching or bulging on only one side of the vessel wall, which creates a localized dilation. This means that instead of the aneurysm involving the entire circumference of the artery, as seen in a fusiform aneurysm, a sacculated aneurysm emerges from one specific point, forming a sac-like structure.

The feature of a sacculated aneurysm is crucial in understanding its pathophysiology as it indicates a specific weakness in the vessel wall that creates this uneven bulging. This can often be related to factors such as trauma, atherosclerosis, or other vascular abnormalities that disproportionately affect one side of the vessel.

The other options describe different characteristics of aneurysms that do not align with the definition of a sacculated aneurysm. A dilated aneurysm affecting the entire circumference refers to a fusiform aneurysm, while aneurysms with calcifications may indicate chronic change or stability but do not pertain to the shape. A ruptured aneurysm denotes a serious complication and does not classify the type of aneurysm based on its morphology.