At what diameter is an infrarenal aorta considered an abdominal aortic aneurysm (AAA)?

Updated: Jan 08, 2019
  • Author: Saum A Rahimi, MD, FACS; Chief Editor: Vincent Lopez Rowe, MD  more...
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Answer

After age 50 years, the normal diameter of the infrarenal aorta is 1.5 cm in women and 1.7 cm in men. An infrarenal aorta that is 3 cm or more in diameter is considered an AAA, even if asymptomatic. Approximately 90% of AAAs are infrarenal.


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