Absence of innominate vein is a rare congenital anomaly of the great veins characterized by absence of the left brachiocephalic vein (or innominate vein), resulting in an anomalous venous vasculature. Patients are usually asymptomatic and the anomaly is typically discovered intraoperatively. An association with persistence of left superior vena cava, permanent levoatrial cardinal vein or anomaly of the inferior vena cava has been reported in some cases.
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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
subaortic course of innominate vein
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agenesis of the superior vena cava
MONDO:0020445
primary superior vena cava aneurysm
MONDO:0958097