trichoepithelioma trichoepithelioma trichoepithelioma is a neoplasm of the adnexa of the skin. its appearance is similar to basal cell carcinoma. trichoepitheliomaother namesbrooke's tumour epithelioma afenoides cysticum .micrograph of a trichoepithelioma. h&e stain.specialtydermatologyusual onsetusually young adultsdiagnostic methodclinical history and examination are important. in a significant number of patients there is a familial trait. examination will white, translucent, slightly raised papules which have a pearly white appearance.treatmentany suspicicion of malignant change calls for adequate excision and histological examination. the only other reason for treatment is cosmetic . partial destruction is usually followed by regrowth. many treatment modalities may be used including surgical excision, curettage, cryotherapy and dermabrasion. high-energy pulsed carbon dioxide laser has also been advocated as a useful treatment. one form has been mapped to chromosome 9p21. types trichoepitheliomas may be divided into the following types:: 672 multiple familial trichoepithelioma solitary trichoepithelioma desmoplastic trichoepithelioma pathology trichoepitheliomas consists of nests of basaloid cells, with palisading. they lack the myxoid stroma and artefactual clefting seen in basal cell carcinoma. mitoses are uncommon when compared to basal cell carcinoma. diagnosis trichoepiteliomas often contain merkel cells; an immunostain for ck20 can be used to demonstrate this.