in reply to your question...Are you speaking of the Ilia vein in his leg..because if you are i had a blood clot in my left Iliac vein. It was 9 inchs long and i spent 11 days in the hospital, however i have a very rare birth defect...which i did not find about intil i was in the hospital..I am missing my Inferior vena Cava.. that is the vein that goes into your heart to clean out the blood. If he has a blod clot in his Iliac VEIN, i can tell you that time and medican will be a blessing.I takes a long time to clear them up. I can give you much more information. I guess mant to make sure we are talking abouut the same thing. I'll be awaiting you respone.