Abstract
An 87-year-old woman was admitted to the hospital because of fever. Laboratory examination showed that the origin of the fever was pyelonephritis. Ultrasonography incidentally demonstrated a dilatation of the portal vein. Subsequently, enhanced computed tomography and angiography were performed, and confirmed a fusiform dilatation of the extrahepatic portal vein at the junction of the superior mesenteric and splenic vein. Surgical intervention was not done because of no symptom and complication. Portal vein aneurysms can be divided into two groups, intrahepatic and extrahepatic portal vein aneurysms. The extrahepatic portal vein aneurysm is rare in comparison with intrahepatic one in Japan. The recent reported cases are disclosed by chance with the development of imaging diagnosis. So, it is important that the diagnosis is made by convenient, non-invasive and useful modalities.
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