Don't worry: The Cisterna Magna is a collection of cerebrospinal fluid at the back of the brain between the two hemispheres of the cerebellum. The size of this normal fluid collection varies between people. A large one is called Mega Cisterna Magna or Giant Cisterna Magna. If accurately diagnosed, it is a normal variant, and causes NO PROBLEMS. Some other conditions can be confused with it.
Answered 1/29/2020
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