Arterioportal fistulas

• May be congenital or posttraumatic (liver biopsy, liver transplant)
• Variably sized, multilobulated, and multicystic appearing mass in the liver
• Enlarged feeding artery with high-velocity and low-resistance flow, arterial flow within the lesion, and reversal of flow and arterialization of the draining portal vein
• Can be seen with [[hereditary hemorrhagic telangiectasia]] where tiny arterioportal fistulas form