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Fig. 2 —Compression of femoral vein on CT scans through acetabula and pubic symphysis in 66-year-old woman. Each lower image is magnification of upper portion on each side. Right femoral vein is elliptic, and hernia sac (arrowhead) lies in direction of minor diameter of right femoral vein (solid white line). Minor diameter of right femoral vein (a) is less than two thirds of diameter of femoral vein (b) in symmetric direction (dotted white line).