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The Anterior Iliac Separation

Alternative Index for Pelvic Morphometry in Fetuses with Down Syndrome

Mark A. Kliewer1, Barbara S. Hertzberg, Kelly S. Freed, Patricia J. McNally and David M. DeLong

1 All authors: Department of Radiology, Duke University Medical Center, Box 3808, Rm. 2526 Blue Zone, S., Durham, NC 27710.



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  		Fig. 1A. —Healthy female fetus at 24 weeks' gestational age. Axial sonogram shows pelvic profile at superior level. Electronic calipers are placed at lateral margins of anterior ends of iliac wings to measure anterior iliac separation. If fetal pelvis is abstracted as a triangle, these calipers are located at two vertices of that triangle (C).

 


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  		Fig. 1B. —Healthy female fetus at 24 weeks' gestational age. Sonogram shows that iliac length is measured by placing electronic calipers at anterior and posterior limits of iliac wings in axial image.

 


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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 {theta} 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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