Congenital arteriovenous fistula

Arteriovenous fistula refers to abnormal channels between arteriovenous. This abnormal channel is called an arteriovenous fistula. Congenital arteriovenous fistula is caused by the abnormal channels of arteriovenous residues in the development and evolution of embryonic mesoderm. Lesions can occur in any part of the human body, they are more common in the limbs, often involve many small arteriovenous branches, fistulas are multiple, and the lesions are often diffuse. The fistula is usually small and free of pulsations and murmurs, and it is often difficult to observe the fistula on arteriography, so it is difficult to diagnose and treat.