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.
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persistent left superior vena cava connecting to the left-sided atrium
MONDO:0020440
right superior vena cava connecting to left-sided atrium
MONDO:0020441
left superior vena cava persisting to left-sided atrium
MONDO:0020442
absence of innominate vein
MONDO:0020443
agenesis of the superior vena cava
MONDO:0020445
primary superior vena cava aneurysm
MONDO:0958097