Which aneurysm type is described as a localized round outpouching, may have a small stalk?

Which aneurysm type is described as a localized round outpouching, may have a small stalk?

• A. Fusiform
• B. Pseudoaneurysm
• C. Saccular
• D. Dissection

Answer: (C)

A localized round outpouching, sometimes with a small neck, is the classic description of a saccular aneurysm. It represents a focal dilation that bulges on one side of the vessel wall, often with a narrow communication (neck) to the parent vessel. This differs from a fusiform dilation, which involves the entire circumference of a vessel segment and appears as a long, spindle-shaped widening. A pseudoaneurysm is a contained rupture where blood collects outside the true vessel wall but remains connected to the artery, usually with a neck, but it is not a true dilation of the wall. Dissection involves a tear in the wall creating a false lumen with a flap, not a single sac outward from the vessel. Therefore, the description best fits a saccular aneurysm.

A localized round outpouching, sometimes with a small neck, is the classic description of a saccular aneurysm. It represents a focal dilation that bulges on one side of the vessel wall, often with a narrow communication (neck) to the parent vessel. This differs from a fusiform dilation, which involves the entire circumference of a vessel segment and appears as a long, spindle-shaped widening. A pseudoaneurysm is a contained rupture where blood collects outside the true vessel wall but remains connected to the artery, usually with a neck, but it is not a true dilation of the wall. Dissection involves a tear in the wall creating a false lumen with a flap, not a single sac outward from the vessel. Therefore, the description best fits a saccular aneurysm.