Disease or Syndrome
aortic dissection
a·or·tic dis·sec·tion [ ey-awr-tik dih-sek-shuhn, dahy- ]
Definitions related to dissection of aorta:
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(aortic dissection) A progressive tear in the aorta characterized by a separation of the medial layer from the outer-most layer.NICHD Pediatric TerminologyU.S. National Cancer Institute, 2021
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(aortic dissection) A progressive tear in the tissue lining the aorta, characterized by the passage of blood from the tunica intima into, and partially through, the tunica media.NCIU.S. National Cancer Institute, 2021
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(aortic dissection) Aortic dissection refers to a tear in the intimal layer of the aorta causing a separation between the intima and the medial layers of the aorta.Human Phenotype Ontology (HPO)The Human Phenotype Ontology Project, 2025
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Aortic dissection is the surging of blood through a tear in the aortic intima with separation of the intima and media and creation of a false lumen (channel). The intimal tear may be a primary event or secondary to hemorrhage within the media. The dissection may occur anywhere along the aorta and extend proximally or distally into other...Merck & Co., Inc., 2025
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Aortic dissection (see the image below) is defined as separation of the layers within the aortic wall. Tears in the intimal layer result in the propagation of dissection (proximally or distally) secondary to blood entering the intima-media space.WebMD, 2025
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An aortic dissection is a serious condition in which the inner layer of the aorta, the large blood vessel branching off the heart, tears. Blood surges through the tear, causing the inner and middle layers of the aorta to separate (dissect). If the blood-filled channel ruptures through the outside aortic wall, aortic dissection is often...Mayo Foundation for Medical Education and Research, 2025
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Aortic dissection describes the condition when a separation has occurred in aortic wall intima, causing blood flow into a new false channel composed of the inner and outer layers of the media. Dissection most commonly occurs with a discrete intimal tear, but can occur without one. An aortic dissection is considered acute if the process...Athenahealth, Inc., 2019
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