Trichilemmal Tumor Undergoing Specific Keratinization

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Abstract
Numerous tumors with follicle-like direction of differentiation were described. At least 3 of them connected to the overlying epidermis are related to the outer root sheath or trichilemma: the tumor of follicular infundibulum and the inverted follicular keratosis or follicular poroma were related to the infundibulum, the tricholemmoma to the lower outer root sheath. On the occasion of a case first diagnosed as proliferating trichilemmal cyst of the scalp, a tumor exhibiting ability to undergo trichilemmal keratinization was isolated. Its histogenesis is described and its peculiarities compared with other lesions showing trichilemmal keratinization.