A dissecting aortic aneurysm occurs when:

A dissecting aortic aneurysm occurs when:

• A. the aorta ruptures, resulting in profound bleeding.
• B. all layers of the aorta suddenly contract.
• C. a weakened area develops in the aortic wall.
• D. the inner layers of the aorta become separated

Answer: (D)

A dissecting aortic aneurysm is a dissection, which happens when there is a tear in the inner lining of the aorta (the intima) and blood pushes between the layers of the aortic wall, causing them to split apart. This separation of the inner layers from the surrounding wall is what defines the condition. It’s different from a rupture, which is a full-thickness tear leading to massive bleeding, and from an aneurysm forming as a weakened, dilated area without the wall splitting. So the defining process is the inner layers becoming separated as blood dissects through the wall.

A dissecting aortic aneurysm is a dissection, which happens when there is a tear in the inner lining of the aorta (the intima) and blood pushes between the layers of the aortic wall, causing them to split apart. This separation of the inner layers from the surrounding wall is what defines the condition. It’s different from a rupture, which is a full-thickness tear leading to massive bleeding, and from an aneurysm forming as a weakened, dilated area without the wall splitting. So the defining process is the inner layers becoming separated as blood dissects through the wall.