[Histologic variation in the width of trichoepitheliomas].

Our histopathological study deals with the evaluation of 232 solitary or multiple trichoepitheliomas, which have been examined by means of hematoxylin-eosin staining. The characteristic features of these benign adnexal tumors have been described with special emphasis on changes of the surrounding stroma. We found a great variation with regard to the size and number of cysts, the maturity of the epithelium and surrounding stroma, as well as the amount of affected stroma. In some cases, a clear separation between trichoepithelioma and keratinizing basal cell epithelioma was not possible.