Which feature is characteristic of pseudoaneurysms?

Pseudoaneurysms are defined by specific characteristics that distinguish them from true aneurysms. One of the most notable features is their structure, which typically involves a narrow neck leading into the sac of the pseudoaneurysm. This narrow neck is formed at the rupture site in the arterial wall, often following a traumatic event or surgical intervention.

The abrupt edges surrounding the neck of a pseudoaneurysm further emphasize its unique formation. This is in contrast to true aneurysms, which generally feature a wide neck and tapering edges. The abruptness of the edges around the pseudoaneurysm's opening contributes to the risk of rupture and is a key indicator in imaging studies. Understanding this morphology is crucial for accurate diagnosis and potential surgical planning.

By recognizing that pseudoaneurysms possess a narrow neck and abrupt edges, healthcare professionals can better assess and differentiate these from other vascular abnormalities, guiding appropriate management and interventions.