Ascending aorta dilatation

Last revised by Yuranga Weerakkody on 3 Aug 2022

Dilatation of the ascending aorta is a common finding in the elderly but unusual in younger patients.


In adults, an ascending aortic diameter greater than 4 cm is considered to indicate dilatation 4. Aneurysmal dilatation is considered when the ascending aortic diameter reaches or exceeds 1.5 times the expected normal diameter (equal to or greater than 5 cm). 


Causes include 1:

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Cases and figures

  • Figure 1: thoracic aorta
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  • Case 1: ascending aortic aneurysm
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  • Case 2: Marfan syndrome
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  • Case 3: aortic dissection
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