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Distal descending

aorta

Aortic arch

Thoracic descending aorta

Mid aortic arch

Proximal aortic arch Ascending aorta 37 mm

40 mm 34 mm

36 mm

Sinotubular junction Sinus of Valsalva (<22 mm/m2) 38 mm

40 mm 33 mm

34 mm 0 1 23 4

5

6 7 8

9 10 11

29 mm 26 mm

23 mm 20 mm

34 mm 31 mm

Abdominal

aorta 23 mm 19 mm

Proximal descending

aorta

Figure 5 Anatomy and aortic segments and upper normal values for aortic dimensions. Numbers represent the 11 aortic segments based on the Society for Vascular  Surgery/Society of Thoracic Surgeons (SVS/STS) classification for surgical and endovascular purposes.136 Z-scores can be calculated for aortic root and ascending aorta. Calculation of z-scores can be performed following these links: https://www.marfan.fr/accueil/z-score-calculus/ or https://marfan.org/dx/z-score-adults.

ESC Guidelines                                                                                                                                                                                          3563

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