Normal aortic dimensions in adults measured from the outer wall

Table 3.19-1. 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
Ascending aorta	25-38	CT
Descending aorta	10-16/m2 BSA	Transesophageal US
Descending aorta	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.