Mega cisterna magna

Case contributed by Dr Karwan T. Khoshnaw

Presentation

Chronic headaches.

Patient Data

Age: 25 years
Gender: Male
MRI

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. 

PlayAdd to Share

Case information

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

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.