<unk>  is the presence of inflammatory leukocytes in the walls of the blood vessels with reactive damage to mural structures leading to compromise of the lumen with downstream ischemia, necrosis, and bleeding. The exact pathogenesis is unknown, and<unk>  can be primary or secondary to underlying disease.
Vasculitis
Arterial thrombosis
Neuritis
Atherosclerosis
Lymphangitis
Embolism
Uveitis
Arteriosclerosis