Associated with chronic otomastoiditis
Lined by keratinized stratified
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