What are ependymal and choroid plexus tumors?

I - Ependymal Tumors : ➢ependymoma (grade II) ; ➢Anaplastic épendymoma (grade III). II – choroid plexus tumors : ➢papilloma (grade I) ; ➢Atypical papilloma (grade II) ; ➢Carcinoma (grade III). These tumors can cause hydrocephalus resulting from the obstruction by the tumor of the CSF flow pathways. More rarely, they can cause hypersecretion of CSF