congenital anomaly of superior vena cava subaortic course of innominate vein https://www.malacards.org/card/subaortic_course_of_innominate_vein UMLS:C4707821 MONDO:0020444 SCTID:766756002 subaortic course of brachiocephalic vein GARD:0019656 Subaortic course of innominate vein is a rare congential anomaly of the great veins characterized by an anomalous course of the left brachiocephalic vein, passing from left to right below the aortic arch and entering the superior vena cava below the orifice of the azygos vein. Patients are frequently asymptomatic and diagnosed incidentally on imaging studies. Other cardiac malformations may be associated. Orphanet:99113 MEDGEN:1637333