Ductus diverticulum

Aortic ductus diverticulum is a developmental outpouching of the thoracic aorta.

Gross anatomy

It is usually seen at the anteromedial aspect of the aorta at site of the ligamentum arteriosum, at the aortic isthmus. This is also the site of 90% of posttraumatic aortic injuries as the ligamentum arteriosum is one of the points the thoracic aorta is tethered; therefore, differentiation of ductus arteriosus from a pseudoaneurysm is important.

In contrast to an aortic pseudoaneurysm, which usually forms sharp margins with the aorta, ductus diverticulum usually appears as a smooth focal bulge with gentle obtuse angles with the aortic wall.


Ductus diverticula are divided into:

  • classic
    • smooth gentle shoulders
    • 33% newborns
    • 9% adults
  • atypical
    • sharper with a shorter and steeper superior slope

Differential diagnosis

Thoracic anatomy
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Article Information

rID: 1239
Systems: Chest, Vascular
Section: Anatomy
Tags: cases, variant
Synonyms or Alternate Spellings:
  • Aortic ductus diverticulum
  • Ductus bump
  • Ductus diverticula
  • Ductus bumps

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