[A] and [B] are mid-sagittal views of the fetal brain demonstrating the measurements of brain stem diameter and brain stem to occipital bone (BSOB) diameter. Three lines are drawn, along the posterior border of the sphenoid bone (line A), along the middle of the line produced by the posterior border of the brain stem and the anterior border of the fourth ventricle (line B) and along the anterior border of the occipital bone (line C). The vertical distances between lines A and B and between B and C are the brain stem diameter and BSOB diameter, respectively.
From: Lachmann R, Chaoui R, Moratalla J, et al. Posterior brain in fetuses with open spina bifida at 11 to 13 weeks. Prenat Diagn 2011; 31:103.
https://obgyn.onlinelibrary.wiley.com/doi/10.1002/pd.2632. Copyright © 2011 John Wiley & Sons Ltd. Reproduced with permission of John Wiley & Sons Inc. This image has been provided by or is owned by Wiley. Further permission is needed before it can be downloaded to PowerPoint, printed, shared or emailed. Please contact Wiley's permissions department either via email:
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