Which veins may get blocked in the following patient?
A 58-year-old man is presented with edema of the lower limb and enlarged superficial veins of the abdominal wall. Examination of radiographs and angiograms reveals obstruction of the inferior vena cava just proximal to the origin of the renal vein.
A. Left suprarenal vein B. Right inferior phrenic vein C. Right hepatic vein D. Left gastric vein E. Portal vein
The veins distal to obstruction are dilated, but the veins proximal to obstruction are not dilated but have low blood pressure. The suprarenal vein drains into the left renal vein and thus is dilated because of high pressure. The right phrenic and right hepatic veins drain into the inferior vena cava above the obstruction. The left gastric vein joins the portal vein, which enters the liver.