The cause for the same is not known but could be attributed to the longer course traversed by the left iliac veins
This venous channel was formed by union of common iliac veins
of either side (Fig 2).
The occurrence of congenital adhesion in the common iliac veins
and their relation to thrombosis of the femoral and iliac vein
4,5] Comparable areas in the lower-extremity venous system include both (but especially the left) common iliac veins
where they are crossed by the right common iliac artery (Fig.
This is probably because that the left iliac veins
join at an angle; being constantly pressed by the loaded left colon, the common iliac artery crossing over the common iliac vein
and the longer course traversed by the left iliac veins
, unlike the right lower limb is not much subjected to these anatomical disadvantages.
The lesion, which originated in the left ovary, showed significant mass effect on the urinary bladder, uterus, right ovary, sigmoid colon and intestinal loops, as well as strong compression syndrome on the common and external iliac veins
Both IVC were formed from the respective common iliac veins
and ran upwards bilaterally to the abdominal aorta as far as the renal veins.
4) Shunts most commonly drain to the inferior vena cava, but drainage can be to the renal veins, iliac veins
, azygous vein or the right atrium.
Venous Doppler echography showed thrombosed left common femoral vein, thrombosed external and internal iliac veins
with hypoechoic thrombus, inferior vena cava identified only at the origin, with reduced caliber, permeable right venous axis.
Extensive bland tumour thrombus was present within the cava and iliac veins
below the tumour.
A computed tomography (CT) scan of the abdomen/pelvis with intravenous contrast revealed thrombosis of the distal inferior vena cava (IVC) and iliac veins
with a congenital absence of suprarenal and intrahepatic segments of the IVC (Fig1&2) with extensive collaterals and prominent ascending lumbar, perivertebral, azygous and hemiazygous venous systems.
In the pelvic region, the postcardinal veins persist as the common iliac veins