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→Cholesteatoma
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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> | ||
===Gross=== | |||
*Whitish mass in the middle ear.<ref name=pmid23217274>{{Cite journal | last1 = Al Balushi | first1 = T. | last2 = Naik | first2 = JZ. | last3 = Al Khabori | first3 = M. | title = Congenital cholesteatoma in identical twins. | journal = J Laryngol Otol | volume = 127 | issue = 1 | pages = 67-9 | month = Jan | year = 2013 | doi = 10.1017/S0022215112002757 | PMID = 23217274 }}</ref> | |||
===Microscopic=== | ===Microscopic=== | ||