Collateral flow to the portal system in obstruction of the iliac veins and inferior vena cava.
D003097:Collateral Circulation; D005260:Female; D006801:Humans; D007084:Iliac Vein; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D011167:Portacaval Shunt, Surgical; D013924:Thrombophlebitis / Q000175:diagnosis*; D014682:Vena Cava, Inferior