Presentation
Chronic headaches.
Patient Data
Age: 25 years
Gender: Male
From the case:
Mega cisterna magna
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Evidence of a prominent posterior fossa retrocerebellar CSF space, subarachnoid septa/dural fold is seen within the space with a normal vermis, normal 4th ventricle, and well-formed both cerebellar hemispheres with no hydrocephalus, the findings consistent with a mega cisterna magna (normal variant).
Case Discussion
Mega cisterna magna refers to a normal variant characterized by a truly focal enlargement of the CSF-filled subarachnoid space in the inferior and posterior portions of the posterior cranial fossa. It is an incidental finding on neuroimaging, and no imaging follow up is necessary.
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