If no other cardiac abnormalities are present,<unk>  will not be treated, as it is usually asymptomatic and unharmful. If it drains into the<unk>  atrium, then deoxygenated blood enters the circulation to the body, and cyanosis may occur.
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