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[[File:Ultrasonographic measurement of aortic diameter at the navel.svg|thumb|center|The standard aortic measurement on abdominal ultrasonography is between the outer margins of the aortic wall.<ref>{{cite web|url=https://emedicine.medscape.com/article/1977715-overview#a3|title=Bedside Ultrasonography Evaluation of Abdominal Aortic Aneurysm - Technique|author=Timothy Jang|date=2017-08-28|website=[[Medscape]]|deadurl=no|archiveurl=https://web.archive.org/web/20180125015641/https://emedicine.medscape.com/article/1977715-overview#a3|archivedate=2018-01-25|df=}}</ref>]]Abdominal aortic aneurysms are commonly divided according to their size and symptomatology. An aneurysm is usually defined as an outer aortic diameter over 3&nbsp;cm (normal diameter of the aorta is around 2&nbsp;cm),<ref name=ACC2005>{{cite journal |vauthors=Hirsch AT, Haskal ZJ, Hertzer NR, Bakal CW, Creager MA, Halperin JL, Hiratzka LF, Murphy WR, Olin JW, Puschett JB, Rosenfield KA, Sacks D, Stanley JC, Taylor LM, White CJ, White J, White RA, Antman EM, Smith SC, Adams CD, Anderson JL, Faxon DP, Fuster V, Gibbons RJ, Hunt SA, Jacobs AK, Nishimura R, Ornato JP, Page RL, Riegel B | title = 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 | journal = J Vasc Interv Radiol | volume = 17 | issue = 9 | pages = 1383–97; quiz 1398 | date = September 2006 | pmid = 16990459 | doi = 10.1097/01.RVI.0000240426.53079.46 }}</ref> or more than 50% of normal diameter.<ref name="SolomonKent2014">{{cite journal|last1=Solomon|first1=Caren G.|last2=Kent|first2=K. Craig|title=Abdominal Aortic Aneurysms|journal=New England Journal of Medicine|volume=371|issue=22|year=2014|pages=2101–2108|issn=0028-4793|doi=10.1056/NEJMcp1401430|pmid=25427112}}</ref> <gallery>File:Ultrasonography of abdominal aortic aneurysm in sagittal plane, annotated.jpgFile:Ultrasonography of abdominal aortic aneurysm in axial plane, annotated.jpg</gallery>The proper projection of the aorta for measurement is the sagittal plane (solid line), since the axial plane measurement (dashed line) may overestimate the diameter when the aorta is not parallel to the skin. ===Report===*Location of aortic aneurysm, such as infrarenal*Any particular shape (other than fusiform).*Aortic diameter, preferably as "in greatest diameter in the sagittal plane" or similar.*Comparison to previous exams Example:{|class="wikitable"| [[File:Ultrasonography of saccular abdominal aortic aneurysm.jpg|ri|150px]]Infrarenal saccular aortic aneurysm of 41 mm in gratest diameter in the sagittal plane (compared to 34 at previous exam on Nov 6, 2017)|}