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In page Central nervous system cyst:

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These classification of cysts are embedded in the endoderm (inner layer) and the ectoderm (outer layer) of the cranial or spinal cord germ layers. They normally take over the neuraxis, the axis of the central nervous system that determines how the nervous system is placed, which allows the cysts to infiltrate the CNS tissues.[1] They are most commonly found in the area near the pineal gland, the chiasmatic cistern, and the cerebellopontine angle space. These common places generally house extensive and continuously growing cysts.[2] Some examples of cysts originating from non-central nervous system tissue include:[citation needed]