Double aortic arch with patent ductus arteriosus in a premature infant: an unusual vascular malformation.

We recently encountered a premature infant with a very unusual form of vascular ring consisting of a double aortic arch with atretic left segment and patent ductus arteriosus. The initial presentation was that of patent ductus arteriosus with left-to-right shunting, but conventional surgical therapy was complicated by the abnormal aortic arch anatomy.