A potential pitfall of pelvic computed tomography

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Abstract
The cross-sectional areas of the common iliac veins were measured by pelvic computed tomography (CT) in 51 patients. The left common iliac vein was significantly larger than the right (p < 0.01) and in 35% of patients there was at least at two-fold difference between the cross-sectional areas of the veins. Recognition of this normal asymmetry is important when interpreting pelvic CT scans. It is though to be due to the oblique course of the left common iliac vein and to partial obstruction of the left common iliac vein by the right common iliac artery.

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