A rare (< 5% of all cases) subset of<unk>  ischemia that has a high rate of mortality approaching 50%.
Risk factors include intrabdominal inflammation and hypercoaguability.
Ischemic colitis
Acute<unk>  ischemia<unk>  venous<unk> 
Chronic<unk>  ischemia ("intestinal angina")
Mesenteric vein thrombosis
Abdominal aortic aneurysm
Splenic infarction
Aortocaval fistula
Superior mesenteric artery syndrome
Acute gastroenteritis
Splenic artery aneurysm
Aortoenteric fisulta