1. Excessive anteriorisation of the superior vena cava associated with an azygos lobe
2. Continuation of the azygos vein with agenesis of the inferior vena cava;Alex JF;Rev Fr Mal Respir,1982
3. Sur la persistance de la veine cave supérieure gauche chez l’homme;Ancel P;J de la Anat et de la Physiol Normales et Pathologiques,1908
4. The accessory pulmonary lobe of the azygos vein;Anson BJ;Q Bull NW Uni Med School,1940
5. Absence of the Azygos Vein Associated with Double Superior Vena Cava