In<unk> , the<unk>  brachiocephalic vein does not develop fully and the<unk>  upper limb and head and neck drain into the right atrium via the coronary sinus. In isolation, the variation is considered benign, but is very frequently associated with cardiac abnormalities (e.g. ventricular septal defect, atrioventricular septal defect) that have a significant mortality and morbidity. It is more frequent in patients with congenital heart defects. The (right)<unk> <unk>  cava is almost always unaffected by the presence of<unk> .
Persistent left superior vena cava
Tracheal agenesis
Right-sided aortic arch
Congenital stenosis of vena cava
Aberrant subclavian artery
Persistent thyroglossal duct
Interrupted aortic arch
Overriding aorta