Arteriosclerosis obliterans is an occlusive arterial disease most prominently affecting the abdominal aorta and the small- and medium-sized arteries of the lower extremities, which may lead to absent dorsalis pedis, posterior tibial, and/or popliteal artery pulses.It is characterized by fibrosis of the tunica intima and calcification of the tunica media. [Source: Wikipedia 
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