Pathology Cholesteatoma; cystlike, expanding lesions of the temporal bone, lined by stratified epithelium and containing desquamated keratin and purulent material Classification Congenital cholesteatoma Acquired cholesteatomaPathology ◼ Cholesteatoma: cystlike, expanding lesions of the temporal bone, lined by stratified epithelium and containing desquamated keratin and purulent material. ◼ Classification ◼ Congenital cholesteatoma ◼ Acquired cholesteatoma