What defines an aneurysm?

An aneurysm is defined as a weakened area of a blood vessel that extends or bulges outward, forming a sac-like structure. This occurs due to a disruption in the vascular wall's integrity, often resulting from factors such as hypertension, atherosclerosis, or genetic predispositions. The bulging can occur in arteries or veins and is most commonly associated with arteries.

As blood flows through the affected area, the pressure can further exacerbate the weakening, leading to potential complications such as rupture, which can be life-threatening depending on the location of the aneurysm. Understanding this definition is crucial for recognizing the risks and the necessary medical interventions involved with aneurysms.