I HAVE A 4.2x4.0cm. cyst on the back of the brain. it looks like an arachnoid cyst.wont know till i have an MRI. if it is a arachnoid cyst it is a build up of spinal fluid. i dont know how they treat it. i am just scared to death.please anyone give me any information that have. it is over 2 inches in size. thank you so much.
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