There are different ways to classify the types of Abdominal Aortic Aneurysm (AAA).
1. By shape
- Fusiform AAA: This is the most common type of AAA, accounting for around 80-90% of cases. The prevalence of fusiform AAA is higher in men than in women, and it increases with age.
- Saccular AAA: This is a less common type of AAA, accounting for around 10-20% of cases. Saccular AAA tends to occur more frequently in women and younger patients, and it has a higher risk of rupture compared to fusiform AAA.
2. By location:
- Infrarenal AAA: This is the most common location for AAA, accounting for around 95% of cases. The incidence of infrarenal AAA increases with age and is more common in men than in women.
- Juxtarenal AAA: This type of AAA accounts for around 2-5% of cases. Juxtarenal AAA tends to occur more frequently in women and is associated with a higher risk of rupture compared to infrarenal AAA.
- Suprarenal AAA: This type of AAA is rare, accounting for less than 1% of cases. Suprarenal AAA tends to occur in women and is associated with a high risk of rupture and mortality.
3. By size:
- Small AAA: This refers to an AAA with a diameter of less than 5.5 cm. Small AAAs tend to grow slowly and have a lower risk of rupture, but they still require monitoring.
- Large AAA: This refers to an AAA with a diameter of 5.5 cm or greater. Large AAAs tend to grow more rapidly and have a higher risk of rupture and mortality.
4. By symptoms:
- Symptomatic AAA: This refers to an AAA that causes symptoms such as abdominal pain, back pain, or tenderness. Symptomatic AAAs tend to be associated with a higher risk of rupture and require urgent treatment.
- Asymptomatic AAA: This refers to an AAA that does not cause any symptoms. Asymptomatic AAAs are typically discovered incidentally during imaging tests performed for other reasons.