MedlinePlus: Pulmonary Arteriovenous Fistula
Explains the abnormal passageway (fistula) between an artery and vein that occurs in the blood vessels of the lungs, diverting blood and causing it not to be oxygenated properly.
Merck Manual: Arteriovenous Fistula
Overview of arteriovenous fistula, an abnormal opening between an artery and a vein that allows blood to flow directly from one to the other, bypassing the capillaries.
eMedicine.com: Coronary Artery Fistula
Clinical description of the condition, also known as a coronary arteriovenous fistula, in which a sizable communication exists between a coronary artery and either a chamber of the heart or any segment of the systemic or pulmonary circulation.