MAYleft-sided predominance of iliofemoral venous thrombosis and of post-thrombotic stricture formation.
SUlMlMARYThe gross anatomy of the inferior vena caval bifurcation has been studied by dissection, corrosion cast preparation, and phlebography.Results have shown that :-I . T h e right common iliac artery crossed the junction of the left and right common iliac veins in 73 of 93 dissections.2. Compression of the left common iliac vein where it is crossed by the right common iliac artery was present in 29 of 54 phlebograms and in 8 of 9 corrosion casts, but in 5 of the latter there was no diminution in cross-sectional area.3. Bands within the lumen of the left common iliac vein were present in 14 of IOO dissections, in 2 of 9 casts, and in 8 of 55 phlebograms.4. There is no evidence that bands are the result of thrombosis, but their aetiology remains in doubt. 5. Symptoms rarely, if ever, result from the presence of left common iliac compression or bands, but these may influence the localization of iliofemoral venous thrombosis and of post-thrombotic stricture formation.