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Fig. 1C. —Healthy female fetus at 24 weeks' gestational age. Drawing superimposed on sonogram shows isosceles triangle formed by iliac wings and anterior iliac separation (a). Iliac angle is measured at convergence of lines drawn tangent to posterolateral margins of right and left wings of ilia. Anterior iliac separation is chord of iliac angle. Therefore, these two measurements are intimately related, both conceptually and mathematically.

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