A localized dilatation (saccular, fusiform, or dissecting) of the wall of the abdominal aorta (the portion of the descending aorta that passes from the aortic hiatus of the diaphragm into the abdomen, descending ventral to the vertebral column, and ending at the fourth lumbar vertebra, where it divides into the two common iliac arteries). It is generally found to involve the renal arteries and frequently the iliac arteries. Occasionally the dilatation can extend upward through the diaphragm.
In the realm of cardiovascular health, there exists a phenomenon known as an aneurysm. This condition manifests when a specific region within the mighty aorta, which serves as the primary artery of the heart, experiences a weakening of its structure and subsequently assumes a bulging formation reminiscent of a balloon. To be more precise, this vascular anomaly typically occurs within the abdominal segment of the aorta, which plays a pivotal role in the distribution of vital blood supply to the lower regions of the human body.