title: Cholesteatoma or keratoma: A pathological approach.
abstract: A good knowledge of the pathogenesis of cholesteatoma is as necessary for the otoradiologist as for the otologist. The basic process consists in an ectopic presence in the middle ear of a basal Malpigian like epithelium. Different types of cholesteatoma exist, from the cystic form to the invasive form. While a parameter such as density may vary, the most important information the otologist expects from the radiologist is the definition of bone erosion delineating the extension of this disease.
mesh_terms: D002781:Cholesteatoma / Q000473:pathology* / Q000601:surgery; D004427:Ear Diseases / Q000473:pathology / Q000601:surgery; D004432:Ear, Middle / Q000473:pathology*; D004848:Epithelium / Q000473:pathology; D006801:Humans; D007642:Keratosis / Q000473:pathology* / Q000601:surgery