Aortic Dissection in the Chest (IMAGE) Umea University Caption This is an illustration of an aortic dissection in the length axis (figure A) and in a cross section (figure B). Aortic dissection is caused when a sudden rupture in the inner wall of the vessel causes blood to flow into the aortic wall, resulting in structural weakening. Credit Mattias Pettersson/Umeå University Usage Restrictions Mattias Pettersson/Umeå University License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.