Aneurysm, syphilitic:
Chapter: 10
Uncommon lesion; usually affects the ascending aorta and arch. Microscopically, there is endarteritis and periarteritis of the vasa vasosum, with obliterative changes, leading to focal necrosis and scarring of the media and disruption of the elastic lamellae and weakening of the wall. Under the pressure of blood pumped from the left ventricle, the ascending aorta and arch dilate.
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