Congenital arteriovenous fistula between an intercostal artery and the left brachiocephalic vein.

Congenital arteriovenous fistulas between the thoracic arteries and the systemic veins are rare, and in clinical terms may mimic patency of the arterial duct. We present a neonate with a large arteriovenous fistula between the left sixth intercostal artery and the left brachiocephalic vein, to the best of our knowledge a unique site of drainage. To our knowledge, ours is also the earliest presentation and treatment of a thoracic arteriovenous fistula.