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# Overview
An abdominal aortic aneurysm is a localized dilatation of the abdominal aorta, that exceeds the normal diameter of the abdominal aorta by more than 50%.  The normal diameter of an aorta depends on the patient's age, sex, height, weight, race, body surface area, and baseline blood pressure.  On average, the normal diameter of the infrarenal aorta is 2 cm, and therefore a true AAA measures 3.0 cm or more.  Aortic ectasia is a mild generalized dilatation (<50% of the normal diameter of  2.9 cm) that is due to age-related degenerative changes in the vessel walls.

# Causes

## Life Threatening Causes
Abdominal aortic aneurysm is a life-threatening condition and must be treated as such irrespective of the underlying cause.
- Abdominal trauma
- Bacteremia
- Gastrointestinal perforation
- Vertebral osteomyelitis

## Common Causes
- Abdominal trauma
- Atherosclerosis
- Marfan syndrome

# FIRE: Focused Initial Rapid Evaluation
A Focused Initial Rapid Evaluation (FIRE) should be performed to identify patients in need of immediate intervention.
Abbreviations:

# Complete Diagnostic Approach
A complete diagnostic approach should be carried out after a focused initial rapid evaluation is conducted and following initiation of any urgent intervention.

# Treatment
Shown below is an algorithm summarizing the treatment of Abdominal aortic aneurysm according the the  guidelines.

# Do's

# Don'ts
-  Singh, K.; Bnaa, KH.; Jacobsen, BK.; Bjrk, L.; Solberg, S. (2001). "Prevalence of and risk factors for abdominal aortic aneurysms in a population-based study : The Troms Study". Am J Epidemiol. 154 (3): 23644. PMID 11479188. Unknown parameter |month= ignored (help).mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"\"""\"""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{display:none;font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
-  Santosa, F.; Schrader, S.; Nowak, T.; Luther, B.; Kroger, K.; Bufe, A. (2013). "Thoracal, abdominal and thoracoabdominal aortic aneurysm". Int Angiol. 32 (5): 5015. PMID 23903309. Unknown parameter |month= ignored (help)
-  Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0.CS1 maint: Multiple names: authors list (link)
-  Clifton MA (Nov 1977). "Familial abdominal aortic aneurysms". Br J Surg. 64 (11): 7656. doi:10.1002/bjs.1800641102. PMID 588966.
-  Josselin-Mahr, L.; El Hessen, TA.; Toledano, C.; Fardet, L.; Kettaneh, A.; Tiev, K.; Cabane, J. (2013). "". Presse Med. 42 (2): 1519. doi:10.1016/j.lpm.2012.03.003. PMID 22552044. Unknown parameter |month= ignored (help)
-  Greenhalgh RM, Powell JT. "Endovascular repair of abdominal aortic aneurysm". N. Engl. J. Med. 358 (5): 494501. doi:10.1056/NEJMct0707524. PMID 18234753.
-  Fink, HA.; Lederle, FA.; Roth, CS.; Bowles, CA.; Nelson, DB.; Haas, MA. (2000). "The accuracy of physical examination to detect abdominal aortic aneurysm". Arch Intern Med. 160 (6): 8336. PMID 10737283. Unknown parameter |month= ignored (help)
-  Baxter, BT.; McGee, GS.; Flinn, WR.; McCarthy, WJ.; Pearce, WH.; Yao, JS. (1990). "Distal embolization as a presenting symptom of aortic aneurysms". Am J Surg. 160 (2): 197201. PMID 2200293. Unknown parameter |month= ignored (help)
-  Nigro, G.; Giovannacci, L.; Engelberger, S.; Van den Berg, JC.; Rosso, R. (2011). "The challenge of posttraumatic thrombus embolization from abdominal aortic aneurysm causing acute limb ischemia". J Vasc Surg. 54 (3): 8403. doi:10.1016/j.jvs.2011.01.051. PMID 21477964. Unknown parameter |month= ignored (help)