Table 3.18-1. Normal aortic dimensions in adults measured from the outer wall

Aortic segment

Diameter (mm)

Imaging study

Aortic annulus

F: 23 ± 2

M: 26 ± 3

Transthoracic US

Sinus of Valsalva

F: 30 ± 3

M: 34 ± 3

Transthoracic US

Aortic root

<37

Transthoracic US

Proximal ascending aorta

F: 26 ± 3

M: 29 ± 3

Transesophageal US

Ascending aorta

14-21/m2 BSA

Transesophageal US

25-38

CT

Descending aorta

10-16/m2 BSA

Transesophageal US

17-28

CT

Abdominal aorta

14-21

B-mode US

BSA, body surface area; CT, computed tomography; F, female patients; M, male patients; US, ultrasonography.