Nov 19, 2024 · A mega cisterna magna is thought to occur in ~1% of all brains imaged postnatally. It constitutes 54% of all cystic posterior fossa malformations 4. Associations. Especially if noted antenatally, a mega cisterna magna has been associated with: infarction. inflammation/infection: particularly cytomegalovirus

A mega cisterna magna is a controversial subject. In general, however, the term refers to non-pathological enlargement of the retrocerebellar CSF space, not associated with cerebellar abnormalities (normal cerebellar vermis and hemispheres).

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.

Feb 12, 2025 · The cisterna magna (also known as the posterior cerebellomedullary cistern) is the largest of the CSF-filled subarachnoid cisterns.

Mega cisterna magna is a benign variant of development in the cistern is enlarged, seen in 1-3% of the population. Since it communicates with the subarachnoid space, is not associated with hydrocephalus

Sep 18, 2024 · Mega cisterna magna is an incidental finding on neuroimaging, and no imaging follow-up is necessary. The presence of a normal posterior fossa and vermis distinguishes it from a Dandy-Walker malformation , and the absence of mass effect distinguishes it …

Aug 19, 2018 · An enlarged posterior fossa 'CSF' space posterior to the cerebellum has a number of differentials that include: mega cisterna magna epidermoid cyst arachnoid cyst Careful attention to the cerebellum needs to paid as also to be considered are:...

Incidental MRI findings are of mega cisterna magna. MRI was done for headache and limb weakness but was unremarkable for gross abnormality related to the mentioned complaint.

CT images illustrate enlarged cisterna magna without enlargement of the posterior fossa or vermian hypoplasia, findings suggest an incidental mega cisterna magna. No gross pathology explains delayed milestones.

Gaillard F, Mega cisterna magna. Case study, Radiopaedia.org (Accessed on 10 Apr 2024) https://doi.org/10.53347/rID-9768