Anatomy General anatomy 425f7fdb 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 & preveebral vein High-Yield Explanation Superficial epigastric vein drains into the femoral vein&ileo lumbar vein drains into common iliac vein Ref: Gray's 39e/p10