title: [Occult Shrapnell cholesteatoma].
abstract: The pathological process in the middle ear leading to a cholesteatoma arises in the tympanic membrane from the papillae of the multilayered keratinizing squamous epithelium. A prerequisite is chronic recurrent middle ear inflammation and granulation tissue in Prussak's space. Constant squamous cells within a progressively growing papilla from the stratum corneum. Finally a cholesteatoma sac appears which perforates into the middle ear cavity.
mesh_terms: D002781:Cholesteatoma / Q000473:pathology*; D004848:Epithelium / Q000473:pathology; D006097:Granulation Tissue / Q000473:pathology; D006801:Humans; D010033:Otitis Media / Q000473:pathology; D014432:Tympanic Membrane / Q000473:pathology*
vernacular_title: Das okkulte Shrapnell-Cholesteatom.