High resolution post-mortem MRI of non-fixed in situ foetal brain in the second trimester of gestation: Normal foetal brain development
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To describe normal foetal brain development with high resolution post-mortem MRI (PMMRI) of non-fixed foetal brains.
We retrospectively collected PMMRIs of foetuses without intracranial abnormalities and chromosomal aberrations studied after a termination of pregnancy due to extracranial abnormalities or after a spontaneous intrauterine death. PMMRIs were performed on a 3-T scanner without any fixation and without removing the brain from the skull. All PMMRIs were evaluated in consensus by two neuroradiologists.
Our analysis included ten PMMRIs (median gestational age (GA): 21 weeks; range: 17–28 weeks). At 19 and 20 weeks of GA, the corticospinal tracts are recognisable in the medulla oblongata, becoming less visible from 21 weeks. Prior to 20 weeks the posterior limb of the internal capsule (PLIC) is more hypointense than surrounding deep grey nuclei; starting from 21 weeks the PLIC becomes isointense, and is hyperintense at 28 weeks. From 19–22 weeks, the cerebral hemispheres show transient layers: marginal zone, cortical plate, subplate, and intermediate, subventricular and germinal zones.
PMMRI of non-fixed in situ foetal brains preserves the natural tissue contrast and skull integrity. We assessed foetal brain development in a small cohort of foetuses, focusing on 19–22 weeks of gestation.
• Post-mortem magnetic resonance imaging (PMMRI) of non-fixed head is feasible.
• PMMRI of unfixed in situ foetal brains preserves the natural tissue contrast.
• PMMRI provide a good depiction of the normal foetal brain development.
• PMMRI of unfixed in situ foetal brains preserves the skull integrity.
• PMMRI pattern of foetal brain development at early gestational age is described.
KeywordsMagnetic resonance imaging Brain Post-mortem Autopsy Foetus
Intermediate zone and subventricular zone
Magnetic resonance imaging
Post-mortem magnetic resonance imaging
Termination of pregnancy
Compliance with ethical standards
The scientific guarantor of this publication is Prof. Fabio Triulzi.
Conflict of interest
The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
The authors state that this work has not received any funding.
Statistics and biometry
No complex statistical methods were necessary for this paper.
Written informed consent was waived by the Institutional Review Board.
Institutional Review Board approval was obtained
• observational study
• performed at one institution
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