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Difference between revisions of "Ditzels"
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*Squamous epithelium in the middle ear - leading to accumulation of keratinaceous debris.<ref>URL: [http://www.harrisonspractice.com/practice/ub/view/Harrisons%20Practice/141015/all/otitis_media_and_mastoiditis http://www.harrisonspractice.com/practice/ub/view/Harrisons%20Practice/141015/all/otitis_media_and_mastoiditis]. Accessed on: 16 March 2011.</ref> | *Squamous epithelium in the middle ear - leading to accumulation of keratinaceous debris.<ref>URL: [http://www.harrisonspractice.com/practice/ub/view/Harrisons%20Practice/141015/all/otitis_media_and_mastoiditis http://www.harrisonspractice.com/practice/ub/view/Harrisons%20Practice/141015/all/otitis_media_and_mastoiditis]. Accessed on: 16 March 2011.</ref> | ||
**''Keratosis obturans'' - accumulation in the external ear canal - is considered to be a different process;<ref>{{cite journal |author=Piepergerdes MC, Kramer BM, Behnke EE |title=Keratosis obturans and external auditory canal cholesteatoma |journal=Laryngoscope |volume=90 |issue=3 |pages=383–91 |year=1980 |month=March |pmid=7359960 |doi= |url=}}</ref> though some consider it a synonym.<ref>{{cite journal |author=Shire JR, Donegan JO |title=Cholesteatoma of the external auditory canal and keratosis obturans |journal=Am J Otol |volume=7 |issue=5 |pages=361–4 |year=1986 |month=September |pmid=3538893 |doi= |url=}}</ref> | **''Keratosis obturans'' - accumulation in the external ear canal - is considered to be a different process;<ref>{{cite journal |author=Piepergerdes MC, Kramer BM, Behnke EE |title=Keratosis obturans and external auditory canal cholesteatoma |journal=Laryngoscope |volume=90 |issue=3 |pages=383–91 |year=1980 |month=March |pmid=7359960 |doi= |url=}}</ref> though some consider it a synonym.<ref>{{cite journal |author=Shire JR, Donegan JO |title=Cholesteatoma of the external auditory canal and keratosis obturans |journal=Am J Otol |volume=7 |issue=5 |pages=361–4 |year=1986 |month=September |pmid=3538893 |doi= |url=}}</ref> | ||
*The etiology not well understood.<ref name=pmid20860924>{{Cite journal | last1 = Nevoux | first1 = J. | last2 = Lenoir | first2 = M. | last3 = Roger | first3 = G. | last4 = Denoyelle | first4 = F. | last5 = Ducou Le Pointe | first5 = H. | last6 = Garabédian | first6 = EN. | title = Childhood cholesteatoma. | journal = Eur Ann Otorhinolaryngol Head Neck Dis | volume = 127 | issue = 4 | pages = 143-50 | month = Sep | year = 2010 | doi = 10.1016/j.anorl.2010.07.001 | PMID = 20860924 }}</ref><ref name=pmid20156369>{{Cite journal | last1 = Louw | first1 = L. | title = Acquired cholesteatoma pathogenesis: stepwise explanations. | journal = J Laryngol Otol | volume = 124 | issue = 6 | pages = 587-93 | month = Jun | year = 2010 | doi = 10.1017/S0022215109992763 | PMID = 20156369 }}</ref> | |||
**Theories include migration/hyperplasia, and metaplasia.<ref name=pmid20156369/> | |||
May be subdivided into:<ref name=pmid20860924/> | |||
*Acquired - due to trauma, surgery or infection. | |||
*Congenital. | |||
===Gross=== | ===Gross=== | ||