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<正>Key Facts Synonyms:Epidermoid tumor,non-neoplastic inclusion cyst,congenital cholesteatoma of the cerebellopontine angle cistern.Definition: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.Classic imaging appearance:（1）Signal shows an insinuating cisternal lesion