arteriovenous malformation abnormal liver vasculature morphology hepatic arteriovenous malformation 2010-10-01T02:28:56Z MP:0010529 MPheno.ontology congenital vascular anomaly in the liver characterized by direct communication between an artery and a vein without passing through the capillary bed csmith hepatic arteriovenous fistula liver arteriovenous fisutla liver arteriovenous malformation