Portal vein aneurysm is very rare. A case of portal vein aneurysm with
out symptoms of portal hypertension is described. Ultrasonography demo
nstrated a hypoechoic mass at the isthmic region of the pancreas. Comp
uted tomography demonstrated the vascular origin of the mass. Angiogra
phy showed a portal vein aneurysm, measuring 3 cm in diameter, at the
junction of portal vein trunk and splenic vein. The association with a
splenic artery aneurysm and absence of portal hypertension lead us to
suggest that our case is congenital. Non-invasive diagnostic methods
are useful to recognize the pathology of portal vein aneurysm and prev
ent complications especially those related to a possible portal hypert
ension.