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