Classification of Cholesteatoma:
-Congenital cholesteatoma is that which has its nidus of trapped squamous epithelium present at birth.
-Primary acquired cholesteatoma is associated with a defect in the pars flaccida.
-Secondary acquired cholesteatoma is associated with a defect in the pars tensa.
-Tertiary acquired cholesteatoma is defined as that which occurs behind a normal appearing tympanic
membrane as the result of implantation or an antecedent middle ear inflammation.