Aortic aneurysm classification

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## Overview

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Aortic aneurysm may be classified according to Crawford classification into 5 types: type 1, type 2, type 3, type 4 and type 5.

## Classification

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There are 2 types of aortic aneurysms: thoracic and abdominal. These can be further classified according to the respective part of the vessel that's been affected:

* Thoracic aortic aneurysm, which occur in the thoracic aorta (runs through the chest);
* Abdominal aortic aneurysm, which occur in the abdominal aorta, are the most common.
* Suprarenal - not as common, often more difficult to repair surgically due to the presence of many aortic branches;
* Infrarenal - often more easily surgically repaired and more common;
* Pararenal - aortic aneurysm is infrarenal but affects renal arteries;
* Juxtarenal - infrarenal aortic aneurysm that affects the aorta just below the renal arteries.

Thoracoabdominal aortic aneurysm may also be classified according to Crawford classification into 5 subtypes/groups:

* Type 1: from the origin of left subclavian artery in descending thoracic aorta to the supra-renal abdominal aorta.
* Type 2: from the left subclavian to the aorto-iliac bifurcation.
* Type 3: from distal thoracic aorta to the aorto-iliac bifurcation
* Type 4: limited to abdominal aorta below the diaphragm
* Type 5: from distal thoracic aorta to celiac and superior mesenteric origins, but not the renal arteries.[1]

## References

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1. ↑ Frederick, John R., and Y. Joseph Woo. "Thoracoabdominal aortic aneurysm." Annals of cardiothoracic surgery 1.3 (2012): 277.