What is an aneurysm?

An aneurysm is best defined as an abnormal widening of a blood vessel, specifically where the vessel has weakened and bulges outwards. This condition can occur in arteries or veins but is most commonly associated with arteries, where the pressure of blood flow can contribute to the enlargement of a section of the vessel wall. The abnormal widening poses a risk as it can lead to potential ruptures, which are serious medical emergencies.

The concept of an abnormal widening highlights the fact that it deviates from the standard structure of blood vessels, which should maintain a consistent diameter to ensure proper circulation and pressure management. Understanding this definition is crucial because it emphasizes the potential dangers linked to aneurysms, such as internal bleeding or blood clots that can result from disruption to normal blood flow.