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Updated: Dec 26, 2025

State of the Art Cranial Ultrasound Imaging in Neonates
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The fetal falx cerebelli.

Matthew T Whitehead1,2, Gilbert Vezina3,4

  • 1Department of Neuroradiology, Children's National Health System, 111 Michigan Ave. NW, Washington, DC, 20010, USA. mwhitehe@childrensnational.org.

Pediatric Radiology
|March 19, 2020
PubMed
Summary

Fetal MRI reveals falx cerebelli abnormalities are common in brain malformations. These changes in the falx cerebelli can help diagnose posterior fossa conditions.

Keywords:
BrainFalx cerebelliFetusMagnetic resonance imagingPosterior fossa

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Area of Science:

  • Neuroimaging
  • Fetal Medicine
  • Developmental Biology

Background:

  • The falx cerebelli, a dural reflection in the posterior fossa, has an undescribed MR spectrum in fetuses.
  • Understanding its normal appearance and variations is crucial for diagnosing congenital abnormalities.

Purpose of the Study:

  • To determine the prevalence of falx cerebelli abnormalities in fetuses with posterior fossa malformations.
  • To compare these findings with age-matched normal fetal MRI exams.

Main Methods:

  • Retrospective review of 424 fetal MRI examinations (223 controls, 201 malformations).
  • Assessment of falx cerebelli location, morphology, size, and number.
  • Statistical analysis including chi-square, linear, and logistic regression.

Main Results:

  • Falx cerebelli abnormalities were significantly more common in fetuses with brain/craniofacial abnormalities (59%) compared to controls (19%).
  • Specific abnormalities were associated with conditions like Blake pouch cysts, rhombencephalosynapsis, Chiari II, Dandy-Walker malformations, and arachnoid cysts.

Conclusions:

  • Structural alterations of the falx cerebelli are prevalent in fetuses with brain and craniofacial abnormalities.
  • Falx cerebelli changes provide valuable diagnostic clues for posterior fossa malformations.