Patient Data
Age: 40 years
Gender: Female
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CSF density space posterior to the cerebellum without any mass effect on underlying cerebellum.
Case Discussion
This either represents an arachnoid cyst of mega cisterna magna; distinguishing between the two can be difficult.
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
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