[Trichoadenoma of Nikolowski--review of four decades and seven new cases]

Trichoadenoma of Nikolowski is a rare, benign, well differentiated, slowly growing tumor of the hair follicle which was first described in 1958 by Nikolowski. 26 cases reported in the literature since then and our seven cases show the following features: a tumor of adults, mostly in the face (57.5%) or buttocks (24.2%), size in general 0.5-1.5 cm, no sex preference. According its morphological differentiation, trichoadenoma is situated between a trichofolliculoma and a trichoepithelioma. The clinical appearance is, misleading, suggesting the diagnosis of basal cell carcinoma or epidermal cyst.