Fetal brain: Cavum septum pellucidi is a fluid-filled space less than 10 mm wide between the frontal horns of the lateral ventricles of the brain, and below the anterior portion of the corpus callosum (connects the two hemispheres of the brain). If it is not seen on fetal head ct between 18 and 37 weeks, midline malformations may be present, and a thorough exam of the fetal CNS should be done.
Answered 6/10/2014
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