individual case reports serve to demonstrate the pathogenetically different renal arteriovenous shunt formations , such as congenital arteriovenous angioma , spontaneous arteriovenous aneurysm , iatrogenic arterio-venous fistula and neoplasia-conditioned arteriovenous fistula .
C0003857
congenital arteriovenous angioma
C0003855
arteriovenous fistula