Mega cisterna magna

Case contributed by Mohammad Taghi Niknejad
Diagnosis certain


Work up for headache.

Patient Data

Age: 60 years
Gender: Female

Focal enlargement of the CSF-filled subarachnoid space is seen in the posteroinferior portion of the posterior cranial fossa, consistent with mega cisterna magna, an anatomical variant.

Case Discussion

Mega cisterna magna is usually an incidental neuroimaging finding, and no imaging follow up is needed. Arachnoid cyst and epidermoid cyst of the posterior fossa can be challenging to distinguish from a mega cisterna manga on CT images.

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