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MR imaging of fetal brain malformations
Charles Raybaud1, Olivier Levrier, Hervé Brunel
1Neuroradiologie, CHU Timone, Université de la Méditerranée, 13005 Marseille, France. craybaud@mail.ap-hm.fr
Summary
Fetal brain MRI provides key insights into malformations, but diagnostic uncertainty persists, especially for subtle conditions. Further clinical-radiological studies are essential for improved understanding and management of these complex cases.
Area of Science:
- Neuroscience
- Developmental Biology
- Medical Imaging
Background:
- Brain malformations are complex congenital abnormalities.
- Accurate diagnosis is crucial for patient management and prognosis.
- Prenatal imaging plays a vital role in identifying fetal brain abnormalities.
Purpose of the Study:
- To classify fetal brain malformations based on developmental principles.
- To discuss features practical for magnetic resonance (MR) imaging in fetuses.
- To evaluate the diagnostic accuracy and limitations of MR imaging compared to clinical outcomes.
Main Methods:
- Review of established data on brain morphogenesis.
- Classification of brain malformations.
- Analysis of 150 malformation cases from over 1,000 fetal MR brain imaging studies.
- Correlation of imaging findings with clinical results.
Main Results:
- Established classification principles for fetal brain malformations.
- Identified specific features useful for MR imaging after mid-gestation.
- Demonstrated significant diagnostic uncertainty beyond well-defined malformations.
- Highlighted discrepancies between ultrasound (US) and MR imaging, particularly for posterior fossa disorders and non-destructive microcephaly.
Conclusions:
- Despite advances, diagnostic challenges remain in fetal brain malformation assessment.
- Discrepancies between US and MR imaging necessitate careful interpretation.
- Long-term prospective clinical-radiological studies are required for better understanding and management.