Left aortic arch with right descending aorta and right ligamentum arteriosum. A rare form of vascular ring.

The combination of left aortic arch, right descending aorta, and right patent ductus arteriosus is a rare form of aortic arch anomaly. Only 11 such cases have been previously reported. A 6-month-old infant with this anomaly manifested severe respiratory difficulty and feeding problems in the early newborn period. The aortic arch abnormalities were confirmed by angiocardiography, and operative correction was successful. This is the first case reported in which the patient developed severe respiratory and feeding difficulties due to this type of a vascular ring.