In case of IVC obstruction, the collateral which opens up are all except -: (A) Superior epigastric & inferior epigastric vein, (B) Azygos & ascending lumbar vein, (C) Superficial epigastric & ileolumbar vein, (D) Lateral thoracic veins & prevertebral vein
Answer is C. 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
-        Hemizygous
-        Ascending lumbar