[Extrahepatic aneurysm of the portal vein. Apropos of 2 cases].

Aneurysms of the portal vein are rare and their origin remains under discussion. They may be intra or extrahepatic and in some patients previous history of portal hypertension may be reported. Nonetheless, numerous cases of congenital origin have been observed in which no factors determining their formation have been found. Two cases of portal aneurysms of extrahepatic localization who were accidentally found in patients with no history of portal hypertension or other known etiologic factors are presented.