Trichoblastic fibroma (fibromatoid trichoepithelioma).

Six examples of so-called trichoblastic fibroma occurred in five females and one male. The age of the patients ranged from 46 to 70 years (mean: 61 years). Three tumours were on the back, one each on the left gluteus, right skull and left thigh; they were present one to 20 years and varied in size from 1.8 to 6 cm. The tumour nodules were easily shelled out at operation, and the macroscopic aspect was that of fibroma. Although there seems to be a close relationship to trichoepitheliomas, this tumour deserves a separation from classical conventional trichoepitheliomas and differs from these by size, consistency, involvement of deeper tissues, nodular character, unusual location, age of patients and additional histopathologic findings. In our opinion, these rare tumours may also be classified as fibromatoid trichoepitheliomas.