Dissecting aneurysm
A localized widening (dilatation) of an artery (an aneurysm) in which the wall of an artery rips (dissects) longitudinally. This occurs because bleeding into the weakened wall splits the wall. Dissecting aneurysms tend to affect the thoracic aorta. They are particularly a major danger in Marfan’s disease.

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longitudinal splitting of the arterial wall resulting from hemorrhage, producing a tear in the intima and establishing communication with the lumen; it usually affects the aorta (aortic dissection) but may also affect other large arteries.

Medical dictionary. 2011.

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