Mega cisterna magna

Case contributed by Dr Karwan T. Khoshnaw


Chronic headaches.

Patient Data

Age: 25 years
Gender: Male

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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Case information

rID: 65713
Published: 20th Jan 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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