1) Necrosis of a tunica media 
Necrosis of a tunica media. ... (05 Mar 2000) ... 
(me″de-o-nә-kro´sis) focal areas of destruction of the elastic tissue and smooth muscle of the tunica media of a blood vessel, especially of the aorta or its major branches.
Type: Term Pronunciation: mē′dē-ō-nĕ-krō′sis Definitions: 1. Necrosis of a tunica media.
medionecrosis Necrosis of the tunica media of a blood vessel or the middle of an artery, usually the aorta. The tunica media is the middle layer in the wall of a blood vessel which is composed of circular or spiraling smooth muscle and some elastic fibers.