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Key FactsrnSynonyms: Epidermoid tumor , non-neoplastic inclusion cyst , congenital cholesteatoma of the cerebellopontine angle cistern.rnDefinition: Congenital lesion arising from inclusion of ectodermal epithelial elements at time of neural tube closure during 3rd to 5th week of embryonic life, resulting in migration abnormalities of epiblastic cells.