A direct communication between an artery and vein, without an intervening capillary bed. It can occur as a congenital abnormality or it may be ; acquired following injury or surgery. It may I affect the limbs, lungs, or viscera and may be single or multiple. If the connection is large, the short-circuiting of blood may , produce heart failure. Large isolated arteriovenous aneurysms may be closed surgically.
An abnormal communication between an artery and a vein. It is usually the result of an injury, such as a stab or a gunshot wound, which involves both a neighbouring artery and vein.
An aneurysm of congenital or traumatic origin in which an artery and vein become connected. Symptoms may include pain, expansive pulsation, and bruits or, occasionally, high-output heart failure.