Extrahepatic arterioportal venous fistula: multidetector CT and volume-rendered angiographic imaging.

We present a case of unsuspected extrahepatic arterial-main portal venous fistula diagnosed by multiphase computed tomography with three-dimensional volume-rendered computed tomographic angiography. To our knowledge, this entity has not been reported previously in the literature, and it represents an example of pathology that may only be detected and clarified with multiphase imaging with three-dimensional rendering. This finding has great clinical importance in patient management.