Case report: splenic vein aneurysm--report of a lesion that progressively expanded.

A case of splenic vein aneurysm is reported. The patient was diagnosed as having a cirrhotic liver with portal hypertension. Computed tomography and angiography demonstrated a splenic vein aneurysm with saccular dilatation. The splenic vein aneurysm increased in size as the hepatic cirrhosis deteriorated; however, there were no complications such as rupture or thrombosis. To our knowledge this is the first report describing the development of a portal system aneurysm.