Does the wall of a pseudoaneurysm contain endocardium?

A pseudoaneurysm is a pathological condition that arises when there is a breach in the vessel wall, leading to the formation of a pulsating hematoma that communicates with the vascular lumen. The wall of a true aneurysm consists of all three layers typically found in a blood vessel: intima, media, and adventitia. In contrast, pseudoaneurysms do not have a true vessel wall composition. Instead, they are usually surrounded by a fibrous capsule formed by surrounding tissues and do not have a well-defined structure like true aneurysms.

Since a pseudoaneurysm lacks an appropriate vascular structure, it does not contain endocardium. Endocardium is the innermost layer of the heart chambers, and its presence would imply the structure is part of the heart wall itself. Given that pseudoaneurysms stem from a layer of tissue surrounding a hematoma rather than from the heart's structure itself, the correct answer clarifies that the wall of a pseudoaneurysm does not consist of endocardium.