Normal brain fetal MRI (24 weeks)

Case contributed by Prof. Stacy Goergen

Presentation

Suspicion of mega cisterna magna on 2nd trimester ultrasound.

Patient Data

Age: 24w4d GA
Gender: Male

Normal fetal brain at 24 weeks gestation. No mega cisterna magna or other posterior fossa abnormality.

Normal, gestation appropriate sulcation is shown. Note calcarine and parietooccipital sulci on medial aspect of hemispheres on coronal and axial images respectively. Sylvian fissure opercularization has progressed and early evidence of central sulcus noted on sagittal images. Normal vermis foliation is present on the midline sagittal spoiled gradient echo image.  This is also a nice example of normal, five-layered lamination.

Sagittal acquisition somewhat oblique, but was the best possible.

Normal fetal body MRI at 24 weeks. Note the utility of T1 fat saturated acquisition for the visualisation of fetal bowel (T1 hyperintense meconium) and of the thyroid gland (also T1 bright).

Annotated image

Key findings at 24 weeks gestation.  The central sulcus is now becoming visible.  Normal foliation of the cerebellar vermis nicely depicted, and note visualisation of the pituitary stalk. 5 layered laminar appearance is still seen.

Case Discussion

Normal fetal MRI at 24 weeks gestation, demonstrating the key cerebral features seen at this stage. Compare with the normal fetal MRI at 22 weeks gestation for interval progression. 

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Case information

rID: 50626
Case created: 14th Jan 2017
Last edited: 20th Apr 2017
Inclusion in quiz mode: Included

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