cholesteatoma

noun
cho·​les·​te·​a·​to·​ma | \kə-ˌles-tē-ə-ˈtō-mə, ˌkō-lə-ˌstē-, ˌkäl-ə- \
plural cholesteatomas also cholesteatomata\ -​mət-​ə \

Medical Definition of cholesteatoma 

1 : an epidermoid cyst usually in the brain arising from aberrant embryonic rests and appearing as a compact shiny flaky mass

called also pearly tumor

2 : a tumor usually growing in a confined space (as the middle ear or mastoid) and frequently constituting a sequel to chronic otitis media

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