Anatomy 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 💡 Explanation In case of IVC obstruction, the collateral which opens up are all except - ✓ Correct Answer: C. Superficial epigastric & ileolumbar vein