These tumors cause hydrocephalus and increased intracranial pressure by blocking CSF pathways and by oversecreting CSF. They affect mostly children and young adults and have a papillary basic structure. They are seen in Aicardi syndrome characterized by agenesis of the corpus callosum, chorioretinal lacunae, and infantile spasms.   a Ependymoma   b Ganglioglioma   c Juvenile pilocytic astrocytoma   d Choroid plexus papilloma

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