[Vascular causes of clinically unclear acute abdomen].

CLINICAL ISSUE: Vascular abnormalities are a rare cause of an acute abdomen. They include arterial bleeding and ischemia, the latter being either in the arterial or venous system. The most common cause of an acute ischemic abdomen is acute mesenteric ischemia caused by a thromboembolic occlusion of the superior mesenteric artery, followed by thrombotic occlusion of the portal vein, the mesenteric vein as well as the hepatic veins and the suprahepatic part of the inferior vena cava. In the case of an acute abdomen due to internal bleeding, all abdominal arteries can be the source but most common are ruptures of aortic aneurysms and inflammatory-driven bleeding from the superior mesenteric artery. PRACTICAL RECOMMENDATIONS: Due to the high mortality, vascular causes should be diagnosed as soon as possible. For this purpose, computed tomography (CT) has evolved into the preferred tool due to its high availability and speed. To differentiate various vascular causes of an acute abdomen, it is important to incorporate a CT protocol without contrast media as well as contrast-enhanced series in arterial and venous phases. Conventional angiography has been replaced by CT for the diagnosis of vascular pathologies causing an acute abdomen; however, it plays an increasing role in the treatment of these pathologies.