Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
From the case:
Mega cisterna magna
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Large retrocerebellar space that follows CSF signal on all sequences. Normal cerebellar vermis.
Case Discussion
Incidental mega cisterna magna. Images at higher levels confimed the presence of a normal posterior fossa and vermis distinguishing it from a Dandy-Walker malformation.