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The cisterna magna is a space between the cerebellum and the medulla which allows for drainage of cerebrospinal fluid (CSF).
Arachnoid cysts are sacs filled with CSF located between the arachnoid membrane and the brain or spinal cord. They can be primary or secondary depending on their etiology.
Symptoms of brain arachnoid cysts may include headache, nausea and vomiting, seizures, hearing and visual disturbances, vertigo, and difficulties with balance and walking.
You should talk to your son's neurologist for possible treatment options.