Fig. 4From: The azygos vein pathway: an overview from anatomical variations to pathological changesAzygos continuation. Chest X-ray shows enlargement of the azygos vein (a) on the right superior mediastinum. Axial enhanced CT shows an enlargement of the azygos vein (b–c) and absence of the inferior vena cava with azygos continuation (d)Back to article page