circulatory system (I25.4) Coronary arteriovenous fistula , acquired (I28.0) Arteriovenous fistula of pulmonary vessels Pulmonary arteriovenous fistula : between an artery and vein of the lungs , resulting in shunting of blood . This results in improperly oxygenated blood. (I67.1) Cerebral arteriovenous fistula , acquired (I77.0) Arteriovenous fistula , acquired (I77.2)