A dissecting aneurysm of the aorta is a dissection in the media of the vessel with formation of a new lumen parallel to the original one. The lesion is the result of a peculiar degeneration of the media known as cystic medionecrosis, which is characterized by fragmentation of the elastic fibers with the consequent formation of small cavities in which an amorphous mucopolysaccharide-like material accumulates. Dissection occurs when an intramural hemorrhage takes place in the damaged media as a result of rupture of the vasa vasorum or the intima. Spontaneous dissecting aneurysm is rare in animals but is well-known in man.
|Number of pages||3|
|Publication status||Published - 1981|
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