An Isolated Left Common Carotid Artery Arising From the Ductus Arteriosus and a Complete Vascular Ring

Arch vessel anatomy plays a critical role in both fetal development and postnatal cardiovascular function, with anomalies often linked to compressive symptoms or associated congenital defects. Isolated anomalies of the aortic arch, particularly those forming vascular rings, are rare and clinically significant due to their potential to cause tracheoesophageal compression. This article describes and underscores the rare and unique case of an isolated left common carotid artery (ILCCA), arising from the ductus arteriosus, with a complete vascular ring without intracardiac or genetic defects. The use of annotated 3D models significantly improved understanding of complex anatomy, emphasizing the anomaly's physical basis, clinical relevance, and the importance of advanced imaging for diagnosis and surgical planning.