Fetal Central Nervous System Biometry on MR Imaging
Taylor F. Reichel1,
Ronald M. Ramus2,
Jacqueline T. Caire1,
Linda S. Hynan3,
Kevin P. Magee4 and
Diane M. Twickler1,2
1 Department of Radiology, University of Texas Southwestern Medical Center, 5323
Harry Hines Blvd., Dallas, TX 75390-8896.
2 Department of Obstetrics and Gynecology, University of Texas Southwestern
Medical Center, Dallas, TX 75390-8896.
3 Department of Psychiatry and Academic Computing Services, University of Texas
Southwestern Medical Center, Dallas, TX 75390-8896.
4 Perinatal Associates of Texas, 8160 Walnut Hill La., Dallas, TX 75231.

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Fig. 1A. MR images of head biometry in fetus of 31 weeks' gestation
(based on sonography and clinical findings) with no central nervous system
abnormalities. (1 indicates measurement number 1.) Biparietal diameter is 77
mm.
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Fig. 1B. MR images of head biometry in fetus of 31 weeks' gestation
(based on sonography and clinical findings) with no central nervous system
abnormalities. (1 indicates measurement number 1.) Occipital frontal diameter
is 100 mm (head circumference = [biparietal diameter + occipital frontal
diameter] x 1.57).
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Fig. 1C. MR images of head biometry in fetus of 31 weeks' gestation
(based on sonography and clinical findings) with no central nervous system
abnormalities. (1 indicates measurement number 1.) Cerebellar width is 39
mm.
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Fig. 2A. MR images of head biometry in fetus at 20 weeks' gestation
(based on sonography and clinical findings) with central nervous system
abnormalities. Biparietal diameter (61 mm) and occipital frontal diameter (82
mm) are shown in fetus of 00 weeks' gestation with Chiari II malformation and
meningomyelocele. (1, 2 indicate measurement numbers.)
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Fig. 2B. MR images of head biometry in fetus at 20 weeks' gestation
(based on sonography and clinical findings) with central nervous system
abnormalities. Sonographic biparietal diameter and occipital frontal diameter
in Chiari II malformation.
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Copyright © 2003 by the American Roentgen Ray Society.