Retroaortic Innominate Vein in Association With Pulmonary Atresia/Major Aortopulmonary Collaterals.

Background: Retroaortic innominate vein (RAIV) is an extremely rare anomaly of systemic venous return. The prevalence of RAIV has been estimated to be 0.02% in individuals without congenital heart disease and 0.5% in those with congenital heart disease. Previous studies have demonstrated an association between RAIV and both conotruncal abnormalities and right aortic arch. Our center specializes in surgical procedures for patients with pulmonary atresia with ventricular septal defect and major aortopulmonary collateral arteries (PA/VSD/MAPCAs), and we have frequently observed the presence of RAIV in these patients. The purpose of this study was to evaluate the prevalence and anatomic characteristics of RAIV.

Methods: This was a single-center retrospective review of medical records to identify patients with an RAIV. The study period was 2002 through 2022, with approximately 20,000 patients evaluated during this time frame.

Results: A total of 99 patients were identified with an RAIV. Of the 99 patients, 64 (65%) had PA/VSD/MAPCAs. Other diagnoses included tetralogy of Fallot (n = 16), tetralogy of Fallot with pulmonary atresia (n = 3), double outlet right ventricle (n = 4), peripheral pulmonary artery stenosis (n = 3), and other (n = 9). In the cohort of patients with PA/VSD/MAPCAs, 69% had a right aortic arch and 30% had completely absent central pulmonary arteries.

Conclusions: The overwhelming majority (90%) of patients with RAIV had conotruncal abnormalities, with PA/VSD/MAPCAs accounting for the preponderance of cases in our center.