Absence of the inferior vena cava.
D001401:Azygos Vein / Q000002:abnormalities*; D002648:Child; D006330:Heart Defects, Congenital / Q000150:complications*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D014682:Vena Cava, Inferior / Q000002:abnormalities*