Congenital absence of venous valves.
D000792:Angiography; D005268:Femoral Vein; D006801:Humans; D007084:Iliac Vein; D011152:Popliteal Vein; D014652:Vascular Diseases; D055422:Venous Valves
ANGIOGRAPHY; FEMORAL VEIN; ILIAC VEIN; POPLITEAL VEIN; VASCULAR DISEASES