A rare heart defect characterized by complete lack of anatomical continuity between the transverse aortic arch and the descending thoracic aorta. AAI should be distinguished anatomically from atresia of the aortic arch where continuity between these segments is achieved by an imperforate fibrous strand of various lengths.

Delivery by means of therapeutic termination of pregnancy. Therapeutic abortion may be done to end a pregnancy if the mother's life is in danger or if the baby has abnormalities involving the major organ systems and is not expected to survive after birth or by choice.