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Trichoepithelioma and infundibulocystic basal-cell carcinoma have many features in common, including relative symmetry, follicular differentiation, elements of both basaloid (trichoblastic) and squamoid (spinous) cells, necrotic neoplastic cells, mitotic figures in some of those cells, cords of cells that interconnect, continuity with the infundibular epidermis, infundibular cystic structures, calcification of some of those cystic structures, clefts […]