Isolated Blind-Ended Major Aortic Pulmonary Collateral Artery With an Aneurysm in an Infant With Trisomy 21

In infants, anomalous vessels from the aortic arch are often diagnosed as patent ductus arteriosus or bronchial arteries. We present the case of a 22-day-old female with trisomy 21, found to have a blind-ended aneurysmal vessel originating from the descending aorta. Echocardiography revealed bidirectional flow and computed tomography confirmed the aneurysm without peripheral vessel connection. Since the vessel was not connected to the pulmonary artery and did not course along the peripheral bronchi, we diagnosed the vessel as a blind-ended major aortopulmonary collateral artery. The vessel was treated with catheter embolization using an Amplatzer vascular plug (Abbott Laboratories, Chicago, IL, USA).