This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
Obstruction of inferior vena cava presents as 
Select and explain. 
A. Paraumbilical dilatation, B. Thoracoepigastric dilatation, C. Esophageal varices, D. Hemorrhoids
B: Thoracoepigastric dilatation
Answer: B: Thoracoepigastric dilatation 
Explanation: Inferior vena cava syndrome is a result of obstruction of the inferior vena cava. It can be caused by invasion or compression by a pathological process or by thrombosis in the vein itself.