In a patient with a tumor in superior mediastinum compressing the superior vena cava, all of the following veins would serve as alternate pathways for the blood to return to the right atrium, except-
Whenever there is an obstruction in superior or inferior vena cava, collateral circulation opens up to connect inferior vena cava and superior vena cava. This helps in circulation being maintained by draining into the right atrium. The veins that can form collaterals include
-        Superior epigastric
-        Internal thoracic
-        Lateral thoracic
-        Thoracoepigastric
-        Posterior intercostal
-        Lumbovertebral
-        Superficial epigastric
-        Superficial circumflex iliac
-        Deep circumflex iliac
-        Inferior epigastric
-        External pudendal
-        Azygous
-        Hemiazygous
-        Ascending lumbar
Lateral thoracic vein
Internal thoracic vein
Hemiazygos vein
Vertebral venous plexus