How large must the thoracic and abdominal aortas be to be called aneurysmal

How large must the thoracic and abdominal aortas be to be called aneurysmal?

Any artery dilated by more than 50% of its normal caliber is called aneurysmal. Most authorities define an aortic aneurysm as an aorta that is greater than or equal to 4 cm in diameter in the thoracic aorta and 3 cm in diameter in the abdomen. The aorta should normally decrease in size as it extends distally, and any focal dilation should be considered abnormal.

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