Mega cisterna magna

Case contributed by Paresh K Desai
Diagnosis probable


Antenatal scan in second trimester.

Patient Data

Age: 26 weeks gestation
Gender: Female

Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.


Transcerebellar diameter 26 mm.

Cisterna magna >10 mm.

Conclusion: mega cisterna magna.

Case Discussion

Mega cisterna magna is an anatomic variant. Careful assessment of the cerebellar vermis and fourth ventricle is necessary to exclude cerebellar hypoplasia and a Dandy-Walker malformation.

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