CT of abdominal aneurysm

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Author: Mikael Häggström [notes 1]

Choice of modality

Ultrasonography of abdominal aneurysm is generally the first choice, but abdominal aneurysms are often seen incidentally in abdominal CTs.

Abdominal aortic aneurysm

Size classification of infrarenal aorta edit
Ectatic or
mild dilatation
>2.0 cm and <3.0 cm[1]
Moderate 3.0 - 5.0[1] (or 5.5)[2] cm
Large or severe >5.0[1] or 5.5[2] cm

Abdominal aortic aneurysms are commonly divided according to their size and symptomatology. An aneurysm is usually defined as an outer aortic diameter over 3 cm (normal diameter of the aorta is around 2 cm),[3] or more than 50% of normal diameter.[4] The suprarenal aorta normally measures about 0.5 cm larger than the infrarenal aorta.[5]

Common iliac artery aneurysm

Common iliac artery[6]
Normal Diameter ≤12 mm
Ectasia Diameter 12 to 18 mm
Aneurysm Diameter ≥18 mm


  1. For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Radlines:Authorship for details.


  1. 1.0 1.1 1.2 . Archived copy. Archived from the original on 2017-09-08. Retrieved on 2017-08-23. Page 56] in: Philip Lumb (2014). Critical Care Ultrasound E-Book . Elsevier Health Sciences. ISBN 9780323278171. 
  2. 2.0 2.1 "Screening for abdominal aortic aneurysms: single centre randomised controlled trial ". BMJ 330 (7494): 750. Apr 2005. doi:10.1136/bmj.38369.620162.82. PMID 15757960. 
  3. "ACC/AHA Guidelines for the Management of Patients with Peripheral Arterial Disease (lower extremity, renal, mesenteric, and abdominal aortic): a collaborative report from the American Associations for Vascular Surgery/Society for Vascular Surgery, Society for Cardiovascular Angiography and Interventions, Society for Vascular Medicine and Biology, Society of Interventional Radiology, and the ACC/AHA Task Force on Practice Guidelines (writing committee to develop guidelines for the management of patients with peripheral arterial disease)—summary of recommendations ". J Vasc Interv Radiol 17 (9): 1383–97; quiz 1398. September 2006. doi:10.1097/01.RVI.0000240426.53079.46. PMID 16990459. 
  4. Solomon, Caren G.; Kent, K. Craig (2014). "Abdominal Aortic Aneurysms ". New England Journal of Medicine 371 (22): 2101–2108. doi:10.1056/NEJMcp1401430. ISSN 0028-4793. PMID 25427112. 
  5. Jeffrey Jim, Robert W Thompson (2018-03-05). Clinical features and diagnosis of abdominal aortic aneurysm. UpToDate. Archived from the original on 2018-03-30.
  6. Melissa L Kirkwood. Iliac artery aneurysm. Retrieved on 2018-02-23. Last updated: Mar 27, 2017.