Which are the four types of aneurysms listed?

Which are the four types of aneurysms listed?

• A. Fusiform (most common), Saccular (AKA berry), Dissection, Pseudoaneurysm (false aneurysm)
• B. Fusiform, Saccular, True aneurysm, Dissection
• C. Berry aneurysm, Pseudoaneurysm, Fusiform, Dissection
• D. Fusiform, Saccular, Pseudoaneurysm, True aneurysm

Answer: (A)

Aneurysm classifications here are based on how the vessel dilates and what the wall comprises. The four types listed are fusiform, saccular (berry), dissection, and pseudoaneurysm (false aneurysm). Fusiform means a circumferential dilation that involves the entire vessel wall, producing a barrel-shaped widening and is the most common pattern seen in major arteries. Saccular, or berry, aneurysm is a localized outpouching with a neck, often seen in cerebral arteries, like a small balloon on one side of the vessel. Dissection describes blood entering the layers of the vessel wall through an intimal tear, creating a new false channel within the wall rather than a simple outpouching; this is a different mechanism from a true dilatation. Pseudoaneurysm occurs when there is a rupture of the vessel wall with blood contained by surrounding tissues or the adventitia, so the wall of the pseudoaneurysm isn’t composed of all three normal vessel wall layers. This combination—fusiform, saccular, dissection, and pseudoaneurysm—covers the main morphologic and pathophysiologic categories typically taught, whereas other options mix terms like “true aneurysm” or treat berry/saccular as distinct from saccular, which doesn’t align with standard naming.

Aneurysm classifications here are based on how the vessel dilates and what the wall comprises. The four types listed are fusiform, saccular (berry), dissection, and pseudoaneurysm (false aneurysm).

Fusiform means a circumferential dilation that involves the entire vessel wall, producing a barrel-shaped widening and is the most common pattern seen in major arteries. Saccular, or berry, aneurysm is a localized outpouching with a neck, often seen in cerebral arteries, like a small balloon on one side of the vessel. Dissection describes blood entering the layers of the vessel wall through an intimal tear, creating a new false channel within the wall rather than a simple outpouching; this is a different mechanism from a true dilatation. Pseudoaneurysm occurs when there is a rupture of the vessel wall with blood contained by surrounding tissues or the adventitia, so the wall of the pseudoaneurysm isn’t composed of all three normal vessel wall layers.

This combination—fusiform, saccular, dissection, and pseudoaneurysm—covers the main morphologic and pathophysiologic categories typically taught, whereas other options mix terms like “true aneurysm” or treat berry/saccular as distinct from saccular, which doesn’t align with standard naming.