Idiopathic arteriovenous fistulae in the renal peduncle are rare. A case was discovered during clinical examination, and was confirmed by total and selective arteriography. A vertebral and dise infection of L3-L4 was also present and blood cultures were positive for enterococcus. This fistula had a high blood-flow rate but it has to be stressed that it was well-tolerated by the cardiovascular system. It was also exceptional in that conservative therapy was possible in this case, which is the eighth reported up to the present time.