The site of origin of venous thrombosis.
D005268:Femoral Vein; D006801:Humans; D007084:Iliac Vein; D007866:Leg / Q000098:blood supply*; D009203:Myocardial Infarction / Q000150:complications; D013848:Thigh / Q000098:blood supply*; D013924:Thrombophlebitis / Q000453:epidemiology* / Q000209:etiology