Interrupted Aortic Arch: Assessment of Morphology and Associated Cardiovascular Anomalies on Computed Tomography Angiography

Aim. The present study sought to evaluate the cardiovascular morphology and associated anomalies in patients with interrupted aortic arch (IAA) on CT angiography. Materials and Methods. A retrospective review of our departmental database was conducted to identify patients diagnosed with IAA on CT angiography between January 2014 and September 2022. The demographic information, anatomic characteristics, and associated cardiovascular abnormalities in patients with IAA were assessed. The morphological types of IAA were described in accordance with Celoria-Patton classification. Results. IAA was seen in 49 patients (32 males and 17 females; mean age: 15.9 months). The most common type of IAA based on the site of interruption was type A seen in 27/49 (55.1%) patients, while type B was observed in 22/49 (44.9%) patients. No patient of type C IAA was encountered in the current series. The most commonly associated cardiovascular anomaly was patent ductus arteriosus (PDA) seen in 45/49 (91.8%) patients. Atrial septal defect was seen in 15/49 (30.6%) patients, while 39/49 (79.6%) patients had a ventricular septal defect (VSD). Common arterial trunk was the most common abnormal ventriculo-arterial connection seen in 13/49 (26.5%) patients. Aorto-pulmonary window was associated with 7/49 (14.3%) patients. Conclusion. IAA is a rare congenital heart defect associated with an array of cardiovascular anomalies, most common being PDA and VSD. CT angiography is useful not only in diagnosing and characterizing the IAA but also in identifying associated anomalies which may have a bearing on the clinical presentation, prognosis, and surgical management.