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cholesteatoma

(kə-lĕs′tē-ə-tōmə, kō′lĭ-stē′ə-)
n. pl. cho•les•te•a•to•mas
  1. A tumorlike mass of keratinizing squamous epithelium and cholesterol, usually occurring in the middle ear and mastoid region.pearl tumor
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.