Acquired cholesteatoma

Associated with chronic otomastoiditis

Lined by keratinized stratified

squamous epithelium

Results from pars flaccida retraction & ingrowth of epithelium into trapped pockets with extension into Prussak's space

Cholesteatomas arising from the region of the pars tensa extend into the posterior tympanic cavity and involve the sinus tympani and the facial recess.

Tympanosclerosis - post-inflammatory

fixation of the ossicles with conductive hearing loss

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