Primary epidermoid tumors, or cholesteatomas, are non-neoplastic, cystic lesions lined with a simple stratified squamous epithelium. They are considered to be congenital, arising from misplaced epidermal cell rests . Cholesteatomas of the CPA must be differentiated from the acquired lesions that occur secondary to middle-ear suppurative disease. The latter are usually restricted to the tympano-mastoid region, but erosion of the petrous bone may occur, with the appearance of a petrous apex
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The term vaginitis is one that is applied to any inflammation or infection of the vagina, and there are many different conditions that are categorized together under this ‘broad’ heading, including bacterial vaginosis, trichomoniasis and non-infectious vaginitis.